I recommend seeing this: https://en.wikipedia.org/wiki/Oscillator_(cellular_automaton)
In this problem, all he wants is how many steps are necessary for the automaton to repeat itself.
Reverse Run-Length Encoder
What is the next step in Conway's Life?
Rosenbrock's Banana Function and its derivatives
Basics: 'Find the eigenvalues of given matrix
Binpack Contest: Retro - - Best Packing
DNA Pattern Match: Performance Metric - Speed
QWERTY Shift Code Decoder
GJam 2013 Veterans: Ocean View (Large)
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