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Have you been looking for an excuse to buy a robot vacuum? Well, if $600 off a great model sounds like a good excuse to you, check out this Amazon deal on the Ecovacs Deebot X9 Pro Omni. As of Feb. 27, this robot vacuum is down to $699, a 46% discount off the list price. Not only that, but according to camelcamelcamel, it's never been cheaper than this before.
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Welcome to your guide to Pips, the latest game in the New York Times catalogue.
Comparison between error-diffusion dithering and ordered dithering. Left to right: error-diffusion, ordered.