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A comment on How to avoid being hit by a laser in a room of mirrors [video]. Parent comment

Re:How to avoid being hit by a laser in a room of mirrors [v... by bunabhucan on Monday August 16, 2021 @01:13AM (#28195125)
This video explains it. His pinned comment explains the mod arithmetic:

https://www.youtube.com/watch?v=jJ6FD59U0_E

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Re:How to avoid being hit by a laser in a room of mirrors [v... by Pyramus on Monday August 16, 2021 @03:25AM (#28195752)
I wish he had explained the mod arithmetic more, the periodicity of 4 is really at the heart of the solution.
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Re:How to avoid being hit by a laser in a room of mirrors [v... by parhamn on Monday August 16, 2021 @02:16AM (#28195407)
Thanks for the share! I took some quick (read, not proof-read) snippets on this if anyone wants to see: https://synth.app/s/uiElJvnnk
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