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.
Test for balanced parentheses
Is this matrix orthogonal?
Calculate Euler's phi function
Gauss Eliminate 2-by-2 example
PACMAT - G03 Ghosts use minimum path to PACMAT; 3 Lives
Fix y_correct : Hack
GJam: 2013 Rd1a Bullseye Painting
GJam 2014 China Rd A: Library Sorting (Large)
GJam 2015 Rd1B: Counter Culture
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