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Forcing strobed backlighting on 120 FPS LightBoost LCDs for CRT-quality motion

Raticus79

Seek victory, not fairness
I found out about this at http://www.blurbusters.com. I have it running on my Asus VG278H + Titan setup now and it's amazing.

NVIDIA originally worked with display manufacturers to create LightBoost with the intent of reducing 3D crosstalk. The monitor strobes the backlight once per frame instead of having it on continuously (so it's flashing frames like a CRT or plasma), which syncs with the shutter glasses and reduces the double image effect. They only engage the strobed mode while in stereo 3D mode because it trades off some brightness and colour fidelity.

People realized that this CRT-like display mode would be great for regular 120 FPS gaming and figured out how to hack the display modes so that strobed backlighting is always enabled, and they have a convenient tool for it available now.

You can get more info and download the ToastyX Strobelight utility here: http://www.monitortests.com/forum/T...htBoost-Utility-for-AMD-ATI-and-NVIDIA?page=1

Warning: Don't run this on regular 60Hz monitors. The utility sets a 120 Hz refresh and your monitor won't be able to display anything.

Make sure you warn people not to run ToastyX Strobelight on 60Hz monitors. That's the problem user Hip Hop is having, who wrote he/she is using a VS247H-P -- that's just a 60Hz monitor. Strobelight forces a computer to operate at 120Hz, so 60Hz users should not install Strobelight.

Thanks! Mark Rejhon

(It doesn't enable strobed backlight on regular 60Hz monitors or anything, just these 120Hz ones with Lightboost)

I set up mine by removing all the existing refresh rates and just adding the one "120 Hz strobed" entry. It's strobing in the regular desktop as well as in 120 FPS fullscreen games now, and I don't have to mess around with enabling/disabling it. I didn't notice much difference between the 10% and 100% "brightness" setting as far as motion quality goes, so I just kept it at 100% (longest strobe) to keep the brightness mostly intact.

What's the difference?

These pictures were taken by a "pursuit camera", a setup where the camera pans across the screen at the same speed as the target moving across the screen. This test simulates what happens when our eyes are tracking moving objects. With continous backlight, the image gets smeared across the retina as our eyes move, similar to how a photo gets smudged if the photographer has shaky hands during the exposure.

60 Hz, continous backlight:
CROPPED_60Hz-1024x341.jpg


(no strobing 60Hz because it creates the same flicker as 60 Hz CRTs)

120 Hz, continous backlight:
CROPPED_120Hz-1024x341.jpg


120 Hz, strobed backlight:
CROPPED_LightBoost50-1024x341.jpg

from http://www.blurbusters.com/faq/60vs120vsLB/

How do you tell when it's working?

- While you have something bright displayed, look at a fixed point on the screen, close one eye and and wave your finger across your field of view. The shadow trail your finger leaves behind should be made up of a bunch of separate snapshots instead of a continuous blur.

- Go to this web page in Chrome (120 FPS-friendly browser): http://www.testufo.com/#test=eyetracking *** Epilepsy warning: I'm not sure if this is one of the bad visual patterns ***

If you focus on the top alien, you can see that the image is made up of a bunch of fixed vertical white lines that are just blanking sections to give the illusion of moving squares. Follow the bottom alien and you should see one of two things: either the white lines blur into a gray mess (continuous mode), or you see the distinct lines moving along with the alien (strobed mode).

- try reading a sign with some text while strafing sideways in a first person game.

Requirements:
Windows Vista or later
AMD/ATI or NVIDIA GPU (laptops with switchable graphics are not supported)
LightBoost-capable monitor

These monitors are known to work:
ASUS VG248QE
ASUS VG278H (can take 5-10 minutes to initialize) (AMD/ATI support is currently problematic)
ASUS VG278HE
BenQ XL2411T
BenQ XL2420T
BenQ XL2720T

These monitors do not have LightBoost:
Alienware AW2310
AOC g2460Pqu
ASUS VG236H
BenQ XL2410T
Hanns.G HS233H3B

Other options:
- Samsung's 3D monitors also strobe if the display is set to frame-sequential 3D (doesn't actually have to be showing 3D content)
Tested: S23A700D, S23A750D, S23A950D, S27A750D, S27A950D

http://www.blurbusters.com/zero-motion-blur/samsung/

I´ve used an SA23700D with an AMD 7970 and it works incredible. Bear in mind that with this Samsung monitors it works with both AMD and Nvidia cards.

Lightboost per se works only with Nvidia cards and Nvidia 3D vision monitors.

- some HDTVs can be modified to accept and display 120 fps input without motion interpolation, and many include strobing backlight as part of their motion enhancment. Shorter strobes are claimed as higher refresh rate equivalents, which is where those 480Hz etc refresh rate claims come from. http://www.blurbusters.com/faq/120hz-pc-to-tv/. It looks like they're still early in the investigation so haven't documented much on which ones are working and which aren't, but it's great that they finally figured it out. I'll update if I find a best suggestion for 120 FPS HDTV.

It's referred to as scanning backlight in some places. I like the "strobe" description since it conveys what's going on a bit more clearly.

Downsides:
...However, the one significant flaw I see is the fact that it requires the content to hit and maintain 120 fps....
If your content isn't running at full frame rate, you'll see a double image effect because the same image is in place for two or more strobes. To put it another way, it's bad to have non-updated frames getting strobed again. You see two clear copies instead of a blur. You may find it's better to run in continuous backlight mode for games you can't hit full frame rate on. You can compare 60/120 on screen at the same time here: http://www.testufo.com/#test=framerates

"My colour quality sucks after enabling Lightboost"
Check the recommended settings at http://www.blurbusters.com/zero-motion-blur/lightboost-faq/
 
I've seen it, but haven't played with it yet. Something any person looking at 120Hz/144Hz displays should look into for sure.
 
You should add this Samsung monitors too, it´s on the same website. Tested: S23A700D, S23A750D, S23A950D, S27A750D, S27A950D

http://www.blurbusters.com/zero-motion-blur/samsung/

I´ve used an SA23700D with an AMD 7970 and it works incredible. Bear in mind that with this Samsung monitors it works with both AMD and Nvidia cards.

Lightboost per se works only with Nvidia cards and Nvidia 3D vision monitors.
 
It's awesome technology and something I'm dying to see become the standard.

However, the one significant flaw I see is the fact that it requires the content to hit and maintain 120 fps. That's not a trivial task with even more powerful PCs. For older games, sure, but even hitting a locked 60 fps can be difficult for some of the more recent titles let alone 120 fps.

I was seriously about to buy one of these monitors straight away until I saw this limitation. Pretty much ruined it for me. :\ I'd be annoyed with any games which I could not achieve 120 fps in and it would kill any fun I might have with them.
 
I'd be annoyed with any games which I could not achieve 120 fps in and it would kill any fun I might have with them.

I bought an XL2411T a couple of weeks ago, and since then I've found that I'm perfectly happy dialling down my graphics until I hit the glory that is 144FPS. I have a GTX670, so sometimes things get a little gnarly in more demanding games, but if I find a game that really suffers I can always run the monitor at 120 or 100Hz, or even limit the game to 72FPS (perfectly V-sync'd at 144Hz). As long as I don't drop back down to the 60Hz ghetto :P

I'm just setting up Lightboost now, so I'll test it on the new Dishonored DLC and see how I like it.
 
You should add this Samsung monitors too, it´s on the same website. Tested: S23A700D, S23A750D, S23A950D, S27A750D, S27A950D

http://www.blurbusters.com/zero-motion-blur/samsung/

I´ve used an SA23700D with an AMD 7970 and it works incredible. Bear in mind that with this Samsung monitors it works with both AMD and Nvidia cards.

Lightboost per se works only with Nvidia cards and Nvidia 3D vision monitors.
This app works with AMD as well on a VG248QE. I ran the UFO test with lightboost on and holy crap, what a difference. Never realized how much motion blur LCDs usually add.
 
I bought an XL2411T a couple of weeks ago, and since then I've found that I'm perfectly happy dialling down my graphics until I hit the glory that is 144FPS. I have a GTX670, so sometimes things get a little gnarly in more demanding games, but if I find a game that really suffers I can always run the monitor at 120 or 100Hz, or even limit the game to 72FPS (perfectly V-sync'd at 144Hz). As long as I don't drop back down to the 60Hz ghetto :P

I'm just setting up Lightboost now, so I'll test it on the new Dishonored DLC and see how I like it.
Still, even with a 680, I have trouble hitting 60 fps with the settings I'd like to use.

Even worse, my current monitor is a 27" 1440p display and I'm not sure a high refresh rate equivalent even exists yet. :\
 
It's awesome technology and something I'm dying to see become the standard.

However, the one significant flaw I see is the fact that it requires the content to hit and maintain 120 fps. That's not a trivial task with even more powerful PCs. For older games, sure, but even hitting a locked 60 fps can be difficult for some of the more recent titles let alone 120 fps.

I was seriously about to buy one of these monitors straight away until I saw this limitation. Pretty much ruined it for me. :\ I'd be annoyed with any games which I could not achieve 120 fps in and it would kill any fun I might have with them.
Why does it require 120 FPS? I haven't read up on it in detail, but I don't see why it shouldn't work just as well with 60 FPS (but 120 Hz) in principle. Or any other framerate. I mean, it strobes based on display refresh, not content, right?
 
Why does it require 120 FPS? I haven't read up on it in detail, but I don't see why it shouldn't work just as well with 60 FPS (but 120 Hz) in principle. Or any other framerate. I mean, it strobes based on display refresh, not content, right?

I was confused by this at first too. They have some 60/120 fps comparison GIFs there. It's a weird effect, you actually get a double image (with two distinct overlapping UFOs) because the object strobes twice before updating its position. I don't think it's really a deal breaker since the continuously-lit alternative is similarly unreadable. The way to fix that would be to strobe only when frames are updated, but that would require a hardware update and even then I think it would become a nasty flickery mess.

It's true that you only really get the full benefit if the content's at 120. I think having the clear-but-doubled image is still arguably an improvement over the smudge at 60. YMMV. If you don't like it, just run the game at 60Hz monitor refresh mode and it won't strobe.
 
I have the same monitor as the OP and I'm rocking the lightboost on 50% brightness and it's pretty awesome. Definitely feels great on FPSs.
 
Apparently firefox doesn't support 120Hz. I was wondering why I wasn't seeing any improvement with lightboost. The test in the OP wasn't available when I checked for improvements. Will try this again later.
 
... Samsung monitors ...

Nice, updated.

[...] However, the one significant flaw I see is the fact that it requires the content to hit and maintain 120 fps [...]

Good point, I added a note. If you don't like the effect at lower frame rates the best thing would be to just switch to a continuously-backlit display mode for those games.

Strobed backlighting is one of the Motionflow techniques used on my Bravia TV. It's what the 'Clear' and 'Clear Plus' settings are.

You might be able to get 120 FPS input on that one with that motion setting (and in game mode to cut the input lag too). Check out http://www.blurbusters.com/faq/120hz-pc-to-tv/
 
I dislike it a lot on my Bravia for games and it adds input lag.

Probably cool for 120 Hz displays.

Yeah, if you strobe at 60Hz it just gives CRT flicker. Which model do you have? Apparently one of the newer displays allows it in "game mode" to cut the input lag. Combine that with bumping up the input refresh rate via the hack methods they posted and we might have a winner.
 
Yeah, if you strobe at 60Hz it just gives CRT flicker. Which model do you have? Apparently one of the newer displays allows it in "game mode" to cut the input lag. Combine that with bumping up the input refresh rate via the hack methods they posted and we might have a winner.
I have the KDL-55W805

I'll try that later with the link you gave. I was under the impression this was a Nvidia only thing when I read about it before, so I never tried it.
I heard that MotionFlow always adds input lag though. From ~16ms to ~30ms which is still alright.
 
I just tried it out with Dishonored, locked at 120FPS, and I didn't really like it. Did the finger-waggle test to make sure it was definitely working and everything. Maybe my eyes are just used to LCD blur, but it seemed the slightest bit choppy to me. That's a bad word to use, because it was obviously just as smooth as ever, but I felt like... I don't know, my reptile brain was perceiving the change in frames in a way that I don't when Lightboost is off, or something.

I only gave it about an hour or so, so I'll try it for longer and with different kinds of games. What I really don't like is that is screws up my monitor's colours and brightness that I've been agonizing over for the past couple of weeks. Even with Lightboost brightness at 10% it's severely washed out, and I don't really want to go futzing around with my settings every time I turn it on or off.

Maybe I'm the problem - I only got really into PC gaming in the LCD days, so I never had the fabled CRT experience.
 
Even with Lightboost brightness at 10% it's severely washed out, and I don't really want to go futzing around with my settings every time I turn it on or off.

The "brightness setting" is a bit counterintuitive. The 10% has the shortest strobes, which would have the biggest impact on colour fidelity. I found 100% (longest strobes) was still good for motion improvement and I didn't notice much change in brightness or colour fidelity (but I don't have calibration gear so I'm just eyeballing it).

Maybe try a different game too. I ran into a weird issue with Wasteland Angel where the 3D engine was messing up terribly, like 3D vision gone wrong, and it was rendering the car in different spots front-to-back every other frame as I drove.

I heard that MotionFlow always adds input lag though. From ~16ms to ~30ms which is still alright.

Yeah, that's the frame interpolation overhead. The trick would be to disable frame interpolation while still strobing the backlight, combined with the 120 FPS input (assuming that works). Sony's got "MotionFlow Impulse" for it at 60 FPS, not sure what would happen with the 120 input. http://www.blurbusters.com/sony-motionflow-impulse-mode-reduces-motion-blur-without-interpolation/
Says there's still some lag with this mode but not as much as regular motionflow.
 
Gave me a "HDMI NO Signal" on my monitor everytime on boot.


Had to "refresh" Windows 8 in Safe Mode. Deleted various games.
 
I tried to get it to work with my Sony awhile back when it wasn't confirmed to work. I couldn't get it to work and I was a little bit worried about going further since it wasn't confirmed with the TV yet.

My problem I think was that I was going from my PC to a 15 foot HDMI cord to my receiver through an HDMI cord to my TV.
 
didn't carmack have a 20 minute bit in his keynote talking up the benefits of strobe backlighting as a solution to motion fluidity issues with the rift?
 
Gave me a "HDMI NO Signal" on my monitor everytime on boot.

Had to "refresh" Windows 8 in Safe Mode. Deleted various games.

Ah, that sucks, guess that VS247H-P isn't supported.

didn't carmack have a 20 minute bit in his keynote talking up the benefits of strobe backlighting as a solution to motion fluidity issues with the rift?

Yup, they have a link to it here: http://www.blurbusters.com/john-carmack-discussions-about-motion-blur/
 
I can't get Windows to add 120 Hz to the Sony TV list of modes.

My settings look exactly like this: http://www.blurbusters.com/wp-content/uploads/2013/02/toastyx.jpeg (Had to use that tool because of AMD)
When I set the settings like above for my regular Dell monitor it wants to start into the 120Hz mode and I get the message on the screen by the monitor that it can't accept that kind of signal and I should select 1080p at 60Hz. Also it doesn't matter if it's the secondary or primary in Windows and whether or not the Dell monitor is disconnected.

Haven't had the desire yet to play around with EDID.
 
So when I look at the one with the scrolling squares on my TV with Smooth Motion off, it's a juttery mess, when it's on, I can see the lines. I'm running at 60Hz.
 
Would be great to have the option to run strobing backlight at lower refresh rates like 60Hz/75Hz/80Hz, so you could have significantly reduced blur also with more mundane graphics hardware.

I'm pretty sure I'd personally pick 75Hz flicker - maybe even 60Hz flicker - over motion blur for a lot of games.

Strobing backlights in displays with IPS/PVA panels should make sense, too. They don't reach those 120Hz/144Hz rates that purely gaming-oriented TN displays do, but they could probably be pushed to 75Hz or so in mass production and they have a much better picture quality, so this would be a nice compromise. I'm reluctant to buy one of the 144Hz displays since in many aspects they are such a downgrade from my existing display.
 
I'm curious about this now, but I feel like I might not be able to take advantage of it @ 120fps/1080p with a 7950. Want to check it out when I get home though.
 
I was confused by this at first too. They have some 60/120 fps comparison GIFs there. It's a weird effect, you actually get a double image (with two distinct overlapping UFOs) because the object strobes twice before updating its position. I don't think it's really a deal breaker since the continuously-lit alternative is similarly unreadable. The way to fix that would be to strobe only when frames are updated, but that would require a hardware update and even then I think it would become a nasty flickery mess.

It's true that you only really get the full benefit if the content's at 120. I think having the clear-but-doubled image is still arguably an improvement over the smudge at 60. YMMV. If you don't like it, just run the game at 60Hz monitor refresh mode and it won't strobe.
That sounds very strange. A CRT or DLP display also flashes the same frame multiple times if the framerate does not match the refresh rate, but that doesn't have any visible negative side effects.

Perhaps it's related to the particular method used here.
 
Whoa this sounds trippy and cool as fuck. At first I thought it was kind of a joke to "emulate" a CRT. Now I see it is legit. Neat stuff
 
I want to test this with my plasma at 60 FPS and then try it out on a Lightboost enabled monitor at 120 hz to do an A/B comparison. Anyone have some details on what is the BEST 120 hz Lightboost monitor in terms of panel quality, input lag, image quality etc?
 
I want to test this with my plasma at 60 FPS and then try it out on a Lightboost enabled monitor at 120 hz to do an A/B comparison. Anyone have some details on what is the BEST 120 hz Lightboost monitor in terms of panel quality, input lag, image quality etc?

I've got the Asus VG278H here and I think it's a good choice for the test. It's fine for input lag, good brightness and colour (as good as can be expected with TN). I'd just check some reviews of it vs the BenQ XL2720T.

Edit: got a message from the author, the VG278H has better colour than the XL2720T.

That site said the Samsung ones have more input lag.
 
Getting decent color with Lightboost can be such a pain in the ass and even the Toasty utility can be an annoyance. I have an Asus VG248QE so a lot of the issues could be that the monitor has shit color reproduction (I don't even go above 120hz because 144hz looked awful no matter how much time I spent messing with it) but I am not sure I want to keep dealing with the hassle of trying to use Lighhtboost.
 
That sounds very strange. A CRT or DLP display also flashes the same frame multiple times if the framerate does not match the refresh rate, but that doesn't have any visible negative side effects.

Perhaps it's related to the particular method used here.

Yeah, I think the specific focus on "Sample-and-Hold" motion blur during eye tracking is new. If anyone has a CRT lying around that can support 120 FPS at low resolutions, I'd be curious to see how those tests compare.
 
Does this reduce eye strain or make it worse? Also, I am not a doctor.
If you play for more than an hour with it on a poltergeist comes out of your monitor. In all seriousness, the FAQ page, specifically the Vision section, can provide you a better answer. For some people the flicker will be an issue while others will never notice it, just depends on your sensitivity to it.
 
The bottom one is how mine always looks (crt ftw)

I laugh at the stupid marketing garbage like 'eyestrain' that suddenly isn't valid anymore now nvidia has you new shit to sell.

curved displays you say, oh now 'good screen geometry' is no longer a thing you say?
strobing backlight you say? now eyestrain is no longer a thing you say?
next you'll tell me that lcd monitors actually only have a contrast of about 1:1000

soon: oled, now 1:10000000 contrast but this time it's for realsies
 
This is why 1080i should not be abandoned for the next generation of consoles. I would much rather have a game running at 60 fields per second to get 30fps(effectively 60 half frames per second) 1080i @ 60hz than 30fps 720p @ 60hz. 1080i takes up nearly the same bandwidth yet gives a far superior image.

The issue with 30fps for games is simply the refresh rate doubling the images. I wonder if the video game developer could make a 30fps 720p game then insert blank frames in between each one to fix the image doubling you get even on CRTs. Then again it may just show up as a strobe light effect and induce seizures.

3Dfx's 60Hz/30Hz/15Hz demo proved double image effect back in the day.
 
This is why 1080i should not be abandoned for the next generation of consoles. I would much rather have a game running at 60 fields per second to get 30fps(effectively 60 half frames per second) 1080i @ 60hz than 30fps 720p @ 60hz. 1080i takes up nearly the same bandwidth yet gives a far superior image.

Bandwith is one thing, hardware resources another. I may be wrong, but even if your point is interesting, I don't think, for how modern hardware works, that developers could obtain significant performance boost using 1080i.

Field rendering was a thing on PS2, but more an hardware exploit that worked in that particular case, also not without incovenients.

Furthermore, contrary to CRTs, being modern tvs inherently progressive displays, 1080i has to be deinterlaced with loss of quality and introduction of input lag.

That said, 60fps for life whenever it's possible.
 
I got some messages on reddit from Mark Rejhon, one of the authors on Blur Busters.

Make sure you warn people not to run ToastyX Strobelight on 60Hz monitors. That's the problem user Hip Hop is having, who wrote he/she is using a VS247H-P -- that's just a 60Hz monitor. Strobelight forces a computer to operate at 120Hz, so 60Hz users should not install Strobelight.

Thanks! Mark Rejhon
(updated OP)

Just so you know:

-- About the LightBoost double image effect. It also happens on all strobe displays such as CRT's and plasmas. It is common at 30fps@60Hz and anything that's half framerate the refresh rate. 30fps@60Hz (CRT) and 60fps@120Hz (CRT and LightBoost looks the same for the www.testufo.com frame comparision test). The double image effect of 30fps console games are well known on plasma displays.

-- DLP behaves on average, more like a sample-and-hold display, since the pixel pulses are spread over the whole refresh.

-- More decent LightBoost colors are now achieved on most LightBoost monitors via the picture settings recommended in the LightBoost FAQ at www.blurbusters.com/lightboost/faq The VG278H does definitely have better color than the VG248QE and XL2411T...
 
Sub'd

Might buy a 144Hz Asus monitor in the coming weeks. Thanks!
 
It's not required to hit minimum 120 FPS / 144 FPS for 120hz/144hz fluidity. At least for 120hz, I've found that anything over ~90 FPS is extremely fluid. YMMV...but at 5760x1080, yes, it's hard to max out 120 FPS on lock. Even with 3xTitans and 3930k @ 4.4 GHz. 1080p, sure--trivial.
 
You guys have to check out the tests on the blur busters page after turning strobing on. It's like the framerates doubled. It's insane. Especially the 120hz video of the 360 degree camera pan.

They don't work so well on Firefox though, so I used Chrome. Still picking my jaw off the floor.
 
It's awesome technology and something I'm dying to see become the standard.

However, the one significant flaw I see is the fact that it requires the content to hit and maintain 120 fps. That's not a trivial task with even more powerful PCs. For older games, sure, but even hitting a locked 60 fps can be difficult for some of the more recent titles let alone 120 fps.

I was seriously about to buy one of these monitors straight away until I saw this limitation. Pretty much ruined it for me. :\ I'd be annoyed with any games which I could not achieve 120 fps in and it would kill any fun I might have with them.

Actually you need at minimum 100fps. 120 is the upper limit. It's framerate drops that make it the recommended standard.

I just tried it out with Dishonored, locked at 120FPS, and I didn't really like it. Did the finger-waggle test to make sure it was definitely working and everything. Maybe my eyes are just used to LCD blur, but it seemed the slightest bit choppy to me. That's a bad word to use, because it was obviously just as smooth as ever, but I felt like... I don't know, my reptile brain was perceiving the change in frames in a way that I don't when Lightboost is off, or something.

I only gave it about an hour or so, so I'll try it for longer and with different kinds of games. What I really don't like is that is screws up my monitor's colours and brightness that I've been agonizing over for the past couple of weeks. Even with Lightboost brightness at 10% it's severely washed out, and I don't really want to go futzing around with my settings every time I turn it on or off.

Maybe I'm the problem - I only got really into PC gaming in the LCD days, so I never had the fabled CRT experience.


The colors are a limitation of the hardware. Your issues with motion blur are your own personal quirk.

People have gotten around the color problem by removing the Anti-gloss (AG) coating on their screens.

Here is a great guide on how to do that.

http://www.overclock.net/t/1359419/...g-film-direct-comparison-same-panel-polarizer

Keep in mind removing the coating means you have to place your screen in a location where light can't directly bounce off of it because it will glare. The upside is that even TN panels look better than IPS panels with AG coating.
 
There are bunch of us here with them and I have to say if you play games with speed and are bothered by motion blur get the damn monitors that support it.

wildfire is correct with toastyx cru modification you can use this at 100hz. The big no with this kind of tech is that you only peak at the max and aren't not there a lot.

and just to show off a little wildfire, here's mine without the AG Coating. For the record or as you should see they reflect a lot and will pick up on dirt and finger prints a lot.

The big advantage is much better colors and contrast.

AGRemove_zpsc4db6906.jpg


Next to one GDM-FW900 I got for 150$ this is a steal for 330$ including the removal of AG coating.
 
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