From the Discovery Channel

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Physics: Introduction to geometric optics for lenses and mirrors. Concave, convex, converging, diverging; real, virtual; upright, inverted, magnified, shrunk. Sign conventions for focal length, image distance, object distance, magnification. The lens/mirror equation; the magnification equation. Introduction to ray tracing. This is arecording of a tutoring session, posted with the student's permission. These videos are offered on a "pay-what-you-like" basis. You can pay for the use of the videos at my website: www.freelance-teacher.com For printable documents containing the "handout" and problems discussed in this video series, go to my website. For a list of all the available video series, arranged in suggested viewing order, go to my website. For a playlist containing all the videos in this series, click here: www.youtube.com (1) The lens/mirror equation. Focal length distance, object distance. Convex, concave, diverging, converging (2) Image distance. Real, virtual (3) Continued. Magnified, shrunk (4) Continued. Upright, inverted (5) Continued. Magnification equation (6) Continued. The lens/mirror chart (7) A problem (8) Continued. Ray tracing (9) Continued (10) Another problem (11) Continued tags: educational college student MCAT exam instructional video education

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The lenses I use are coloured contacts, NOT for my vision. They're meant for cosplaying, dressing up or just a one-off. They are not meant to be worn constantly. You should ALWAYS check with an optician before purchasing lenses just to make sure they're ok. If you have a history of eye problems, if your eyes are different shapes, of if the lenses just don't feel right DO NOT USE THEM. Always keep your tools clean. I always wash the tweezers after using them and make sure that the lens cases are super clean. I learned at lot of new tips and tricks for this video from Earaness, check him out his makeup is awesome!: www.youtube.com I've said this in the video but I just want to say it again, ALWAYS check with an optician before doing anything with your eyes. What I used: -Contact lenses (single colour grey): www.funkylenses.co.uk -Lens Tweezers can be found on e-Bay :) -(And for those of you asking the earrings here is the seller I bought them from): www.ebay.co.uk Just as a precaution I'm going to paste the FAQ's from the contact lens company I buy my lenses from: Soak your Funky Eyes in solution for at least 2 hours before wearing them. PLEASE DO NOT OVERWEAR. On the first day, wear for no more than 4 hours, you may then increase this by 2 hours each day but never wear them overnight. DO NOT share this product DO NOT let this product dry out. DO NOT wear or use our products if damaged. DO dispose of this product 30 days after opening. FREQUENTLY ASKED QUESTIONS. Q : How do <b>...</b>

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Expand the description and view the text of the steps for this how-to video. Check out Howcast for other do-it-yourself videos from dpakman91 and more videos in the Eye Care category. You can contribute too! Create your own DIY guide at www.howcast.com or produce your own Howcast spots with the Howcast Filmmakers Program at www.howcast.com Nothing is worse than having a contact slide under your eyelid. OK, there are worse things. But this is one you easily can avoid. To complete this How-To you will need: Good lighting A sink Unscented soap A mirror Your contact lenses And contact lens wetting solution Good lighting A sink Unscented soap A mirror Your contact lenses And contact lens wetting solution Step 1: Find well-lit mirror Find a well-lit room with a sink and mirror. Tip: Close the drain so that if you drop your contact lens, it won't be washed away. Step 2: Wash your hands Wash your hands with unscented soap. Oils and dirt can not only damage your lenses, but could cause eye infections. Tip: Always put your contact lens in before applying makeup. Step 3: Wet the lens Using your index finger and thumb, pick up one of the lenses and moisturize it with some contact lens wetting solution. Step 4: Position lens Hold the lens on the tip of your index finger the way it will go into your eye —bowl shaped, with the "cup" facing up. Tip: Make sure the lens isn't inside out: If it's a perfect "U" it's fine; if the edges flare out, it needs to be flipped. Step 5: Hold eyelid <b>...</b>

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Check out these creepy, scary, freaky and cool contact lenses - perfect for Halloween! Halloween Contacts: www.coastalcontacts.com Some choices: Twilight (Gold Vampire), Banshee, Cat Eyes, Vampire Red, Black Out and more. AboutCoastal Contacts: Coastal Contacts is the largest online retailer of contact lenses and eyeglasses, providing high quality brand name contacts and designer eyeglasses, all delivered to your door for a fraction of the price.

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Convex Lenses

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long awaited video I have more pictures and details where to purchase on my blog iamvonhorror.blogspot.com and my outfit of the day can be viewed here www.youtube.com

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My collection of pictures and mini reviews on the brands I've worn in the past. Part 2: Ordering www.youtube.com Some pix + how to order: dirtontherocks.blogspot.com

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READ!! Canon 5200mm F14 Prime Lens. The world's largest dedicated SLR Super Telephoto lens. Extremely rare. Made in Japan. Most probably a government ordered cold war spy tool - it certainly wasn't designed to just look at the stars with the use of it's ND filters... It uses a mirror & lens combination. The front lens is massive. Rear drop-in filters can be used. •Focal Length: 5150mm •Exposure Control: Light quantity is controlled with the use of built-in ND filters, corresponding to f/14, f/16, f/22, f/32 •Minimum Object Distance: 120 meters (Approx 393 feet!) •Size: 500mm(wide) x 600mm(high) x 1890mm(deep) [20x24x75.6] •Weight: 100kg (220 lbs) without stand. From a Canon Flyer: "This is the only ultra-telephoto lens in the world capable of taking photographs of objects 18 to 32 miles away (30km to 52kms away). Having a focal length of 5200mm, Canon Mirror Lens 5200mm can obtain one hundred times as large an object image as that of a 50mm lens." "For focusing this mounted or fixed lens on an extremely distant object, two aiming telescopes are set on the side of the lens barrel, and the entire lens is placed on a rigid stand which rotates smoothly. Minimizing the overall length had been a big problem in designing this lens. However, the Catadioptric system that is applied to the other two Canon mirror lenses (Canon 800mm f3.8 & 2000mm f11) has succeeded in reducing it down to one third of the nominal focal length. In general focal length and optical aberration increase <b>...</b>

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Learn how to make contact lenses

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www.adorama.com - Camera lens filters and camera lenses explained. In this basic video guide from Adorama TV, Mark Wallace demonstrates exactly how to establish which size filter you require for your lenses, and the best type of camera filters to meet your needs. UV filters are the best for stopping UV rays, as well as safeguarding your precious lens. Polarizing filters assist in reducing reflections and improve saturation in blue skies. You can learn more about optical filters here: www.adorama.com Purchase Pro Optic Filters here now: Pro Optic Cirular Polarizers www.adorama.com Pro Optic UV Filters www.adorama.com Visit www.adorama.com for more photography videos! Still have questions, then send them to: AskMark@Adorama.com www.adorama.com Camera lens filters explained

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L lenses are rugged things. They don't break easy. But one day last year we took on an intern and he proved us wrong. In this video, we show what can be done with a broken L lens by recycling it into the World's First L lens cup made out of a real L lens. Watch this video to see what happens. Bid for the World's First REAL L lens cup on eBay - 100% of the proceeds will go to the Premier's Disaster Relief Appeal of Australia to help the victims of the Australian Flood: cgi.ebay.com

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This is a step-by-step process in producing common optical lenses. It is a great honor to see this video featured on How-To Geek: www.howtogeek.com

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Concave Lenses

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Making of Canon L Series 500mm F4L IS USM. Part 1 of 3 in the production of expensive camera gear. L series is Canon's Premium lens line featuring fluorite lenses. IS refers to Image Stabilzation build into the lens, and USM refers to Ultrasonic Motor drive that makes focusing faster than older systems. Currently I'm using a Rebel XT, although I'm thinking of upgrading to an XTi or 5DMk2. This 500 with the New 5D would be a sweet combination. www.razorfantasygirls.com

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ATTITUDE HOLLAND CONTACT LENSES ○ www.attitudeholland.nl I really love Attitude Holland, They're really nice and like to do anything to help. GREAT CUSTOMER SERVICE + SHIPPING! INFO ON LENSES I USED ○ • TERROR EYES FASHION LENSES • Cathedral04 • B . C = 8.6mm • DIA = 14.0mm • POWER = 0.00 • EXP = 12 months after opening. TWITAAAAWWWRR ○ www.twitter.com DAILYBOOOOOTTTHHH ○ dailybooth.com

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Roger from LensRentals compares the different Nikon Supertelephoto lenses.

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Every so often, internet news aggregator sites run a story about a research group that put an LED into a contact lens, then inserted it into a rabbit's eye. I figured that I would try the same thing, but put the lens into my own eye. I accomplished this by laminating a coil of wire and an 0402 surface-mount LED between two ordinary soft contact lenses. I was hoping the lenses would stick to each other, but they did not, so I ended up fixing the edges together by pinching the plastic together with hot tweezers. This held well enough to capture a minute of video with the LED illuminated in my eye. For video purposes, I mounted the LED facing outward. An actual VR/AR display would have the LED facing inward. I powered the LED by using a very primitive spark-gap transmitter built from a mechanical relay to send RF energy into a larger coil held near my eye. The large coil coupled the energy into the contact lens coil and pulsed the LED. nextbigfuture.com www.cs.uic.edu

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A couple of people have asked me how I get the wide-angle interior car shots in some of my videos. Here's a very quickly thrown together (and admittedly very long) video that shows you really how simple it is to modify your Flip Ultra HD or Flip Mino HD with some off the shelf camcorder accessories and some super glue. *UPDATE* A bunch of people have asked about where to find the wide angle lens - I don't work for Best Buy but you can find it on their website here (you can also find a number of perfectly fine lenses at a number of perfectly fine retailers Filmed on a Sony Webbie MHS-CM1 (Note: This will probably void your warranty if you do it to your camera - YOU HAVE BEEN WARNED!)

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Learn how to put in contact lenses in this free eye care video. Expert: Dr. Edward Weaver, Jr. Contact: www.dredwardweaver.com Bio: Dr. Edward Weaver, Jr. has been a practicing optometrist since graduating from the Pennsylvania College of Optometry in 1986. Filmmaker: Reel Media LLC

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For more, go to: www.eatyourkimchi.com Facebook: www.facebook.com Twitter: www.twitter.com This week's Wonderful Treasure Find comes courtesy of Angelic Rain who let us play around with some Circle Lenses. Circle lenses are meant to make your eyes look bigger by putting a colored rim around your iris. Sounds weird, but looks cool! We also talk about what is Ulzzang a bit as well. Check out www.angelicrain.com for Circle Lenses.

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In this video we take a look at all 3 of the new Fujifilm XF mount lenses for the X-Pro1 camera. We shoot a lady with a box on her head and call it "Danbo". Model featured: J Leong Pricing reference: Fuji 18mm lens: www.digitalrev.com Fuji 35mm lens: www.digitalrev.com Fuji 60mm lens: www.digitalrev.com Fuji X-Pro1: www.digitalrev.com

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Camera and cine lenses need to operate perfectly in extreme conditions, withstanding everything from scorching heat and bitter cold to sandstorms and severe vibrations. The video shows how Carl Zeiss researchers systematically submit lenses to extreme stresses in order to arrive at findings that can help in future lens design and development. The video was shot with a Sony NEX-FS100 and Carl Zeiss ZF.2 SLR lenses with an F to E mount adapter.

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Making of Canon L Series 500mm F4L IS USM. Part 2 of 3 in the production of expensive camera gear. L series is Canon's Premium lens line featuring fluorite lenses. IS refers to Image Stabilzation build into the lens, and USM refers to Ultrasonic Motor drive that makes focusing faster than older systems. Currently I'm using a Rebel XT, although I'm thinking of upgrading to an XTi or 5DMk2. This 500 with the New 5D would be a sweet combination. www.razorfantasy.com

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Multi-Area Mode Full HD D-Movie -- Recording Movies Using One Of Two Formats The D800 records movies with superior resolution through optimal information processing acquired from the 36.3-million pixel image sensor. Users can record 1920 × 1080p/30-fps full-HD movies using either the FX-based movie format or the DX-based movie format according to shooting conditions. The FX-based movie format offers a shallow depth-of-field with an emphasis on blur characteristics, while the DX-based movie format brings subjects closer when lenses with short focal lengths are used. The camera is also equipped with a headphone jack and supports precise adjustment of microphone sensitivity. In addition, users can play back movies or view the live recording of movies simultaneously via the camera's monitor and on an external monitor. The D800 also responds to the needs of professionals who require uncompressed movie files; professional users can link the movie live view mode to an external HDMI monitor, as well as record movies simultaneously onto an external device via the HDMI link. Nikon's newest digital SLR camera also features a time-lapse photography function that captures images at a selected interval and then combines the images to create a time-lapse movie. A time-lapse movie shows the changes in a particular scene that occur over time. I AM THE DIRECTOR iam.nikon-asia.com Cinematography by Andrzej Sekula Directed by Cellin Gluck

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This is the fastest 50mm lens in production, but the Noctilux has been around for a long time, and so has the cult-like following for this lens. But what is the new version like? Has it lost any of the charm of the f/1.0? Watch the review to see if this really could be considered one of the best 50mm lenses. Pricing Reference: www.digitalrev.com Sample shots on our Flickr page: www.flickr.com

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Full review at: www.cameralabs.com : A ten minute video tour comparing the three most popular upgrade options for the Canon 18-55mm DSLR kit lens, by Gordon Laing, Editor of Cameralabs.com. To find out more about these lenses and how their quality compares, see our full review by clicking the link at the start of this text.

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Making of Canon L Series 500mm F4L IS USM. Part 3 of 3 in the production of expensive camera gear. L series is Canon's Premium lens line featuring fluorite lenses. IS refers to Image Stabilzation build into the lens, and USM refers to Ultrasonic Motor drive that makes focusing faster than older systems. Currently I'm using a Rebel XT, although I'm thinking of upgrading to an XTi or 5DMk2. This 500 with the New 5D would be a sweet combination. www.behance.net

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Today, Sony announced the World's first interchangeable lens HD consumer camcorder. The beautiful scenes of Bali were shot using the new NEX-VG10 and shows how interchangeable lenses can help capture beautiful vistas with a shallow depth of field, crisp images of a subject while the background artistically out of focus and rack focus on subjects switching from foreground to background. Sony's NEX-VG10 provides the options previously reserved for professional videographers to consumers. It is equipped with the same ExmorTM APS HD CMOS sensor used in Sony's "NEX-5" and "NEX-3" digital cameras which is approximately 19.5 times bigger than what you would find in conventional camcorders. It has a powerful BIONZTM processor allowing photographers the ability to capture full 1920x1080/60i high definition video at up to 24Mbps for true cinematic Blu-ray quality. Find more about it on our blog: tinyurl.com

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Here is a basic overview for beginners on which type of lenses I recommend as the best for DSLR video shooters. 24-70mm L: goo.gl 50mm USM: goo.gl 50mm: goo.gl 10-20mm Sigma: goo.gl 11-16mm Tokina: goo.gl Canon 60D:goo.gl

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Sometimes what's old becomes new again. It happens in music, fashion, even eye care. Optometrists at Mayo Clinic are using a type of lens originally developed in the late 1800s for some people who can't wear normal contacts. They're called scleral lenses and they're helping many folks with bad vision see.

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I simple tip for quickly changing lenses on your DSLR camera.

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More info Here: thinkintl.tv THiNK Media TV is here: www.youtube.com Sean is Here: twitter.com Cheapest & Best Lenses for DSLR Video | Adapting Nikon Lenses to Canon | TMTV The Adapter: Fotodiox Pro Adapter -- Nikon Lens - Canon EOS Camera Adapter for Canon astore.amazon.com...

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For more information about this event, please go to www.tedxislay.com. This speech was made at TEDxIslay in Austin, Texas on May 15, 2010. All of the speakers were deaf. In the spirit of ideas worth spreading, TEDx is a program of local, self-organized events that bring people together to share a TED-like experience. At a TEDx event, TEDTalks video and live speakers combine to spark deep discussion and connection in a small group. These local, self-organized events are branded TEDx, where x = independently organized TED event. The TED Conference provides general guidance for the TEDx program, but individual TEDx events are self-organized. (Subject to certain rules and regulations.)

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Every Leica lens is hand-crafted and goes through meticulous manufacturing processes to uphold the quality and precision that Leica defines and customers have come to expect. In the age where technology almost inevitably means mass manufacturing, Leica products are still made with exacting precision by the hands of highly-trained technicians. This video gives you a behind-the-scenes look at the craftsmanship and making of Leica lenses in the production facilities of Leica Camera AG.

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It's around the time of the most special day in February - it's pancake day! So, we've decided to review some pancakes (lenses) while cooking pancakes. Pricing Reference: Sony - www.digitalrev.com Olympus - www.digitalrev.com Panasonic - www.digitalrev.com Pentax - www.digitalrev.com

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Full review at: www.cameralabs.com : A five minute tour around the Olympus 7-14mm lens - the world's widest digital zoom lens - by Gordon Laing, Editor of www.cameralabs.com. For complete results and sample images, please check out our full review by clicking the link at the start of this text.

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It's a commonly asked question: what is so special about L lenses? In this video, we compare the Canon 100mm f/2.8L Macro vs the Canon 100mm f/2.8 Macro. The L is all the difference in name but what does that mean in terms of what you get for your money? Canon 100mm f/2.8 L Macro IS USM: www.digitalrev.com Canon 100mm f/2.8 Macro USM: www.digitalrev.com

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RE-UPLOADED for the 7th time. Youtube really hates me damn it. LOL Heres a much quicker way to remove your contact lenses :) For those complaining about this video being scary, I did warn you. - Ommetaphobia is "Fear of eyes".

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GeekBeatTV #220: ‪revision3.com Stretch you photographic creativity with additional lenses for you iPhone's camera, dumbbells that vibrate to intensify your workout, a light switch cover that will hold your keys, and an easy way to never forget a file at home! OlloClip iPhone Lenses The iPhone camera can take some pretty nice pictures, but that fixed lens can be limiting. The OlloClip lets you experiment with a few new ones! geekbeat.tv BodyVib Dumbbells These dumbbells vibrate when you grab them, making your muscles work harder and intensifying your workout. www.ohgizmo.com Sponsored by JackThreads Hey guys, want to shop for clothes from your computer? Head on over to JackThreads and try them out. They can save you up to 80% on popular brands. JackThreads.com Magnetic Light Switch Cover This light switch cover holds your keys magnetically, right by the door, so you'll never lose them. www.ohgizmo.com iTwin Looking for a simple and secure way to connect two computers across the Internet without using cloud storage? The iTwin makes it easy. geekbeat.tv Twitter ‪ ‪twitter.com Facebook ‪ ‪facebook.com Cali on Twitter ‪‪twitter.com What was your favorite gadget from today's episode? Hey geekers ... THANKS for watching!

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Roger from LensRentals compares the different options for supporting a supertelephoto lens.

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www.cameralabs.com - Gordon Laing, Editor of Camera Labs has always wanted to see a Space Shuttle launch, so headed out to Florida from New Zealand, loaded with camera kit. Unfortunately the STS-134 launch was delayed, but he made the most of having a 500mm lens in Florida... Most of the clips in this video were filmed using the Canon 500mm f4L lens, mounted on an EOS 7D. Click the link at the start of this text to see the accompanying review at Camera Labs, which includes many sample images. PS - if you're interested in renting lenses or other camera equipment, please visit www.borrowlenses.com?blpid=cameralabs

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If you're a little nervous about how to put on or take off your contact lenses, don't be. It's a lot easier than you might think. ACUVUE® Brand will show you just how simple applying and removing contacts can be. To learn more about ACUVUE® Brand Contact Lenses, go to www.facebook.com

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Get super wide-angle and fisheye panoramic shots with this fish eye lens attachment. Little magnetically attached Fisheye lenses for mobile phones and those little pocket cams are pretty easy to find... finding a GOOD one that doesn't take a steaming crap on your image quality however is a lot more difficult. But in a fit of curiosity on a recent order from a website called Dealextreme.com I threw in one of these mini fish eye lenses ... and because it was cheap I took it out for a shoot with my iPhone4 and came home rather surprised at the quality of this cheapo chinese fish-eye lens. "15mm Detachable 180-Degree Wide Angle Fish Eye Lens for Cell Phones and Compact Digital Cameras" The DealExtreme SKU is 39814 if you're looking for it. - Creates a 180° wide angle panoramic shot or fisheye - Tiny removable stick-on lens for mobile phones and digital cameras - Equipped with a strap for leave it on your cell phone or a digital camera for quick access Oh, and if you missed it the first time, the OWLE Bubo review is here; www.youtube.com

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Two-part tutorial introducing newcomers to the world of SLR photography to the range of lenses available, explaining the differences.

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Roger from LensRentals compares the different Canon Supertelephoto Lenses.

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