I recommend seeing this: https://en.wikipedia.org/wiki/Oscillator_(cellular_automaton)
It's similar to the previous one, but there are multiple automatons and the problem asks for the previous step to the current state.
Find Rotated Substring
7 segment LED display
Find the 9's Complement
USC Spring 2013 ACM: Walking on Thin Ice
Maximum Intra-Vector Swaps
PACMAT 04 - Optimized Ghosts, Equal Speed, 10 Lives
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