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## Main Question or Discussion Point

Suppose an array of booleans with an even number of true values. I need an algorithm that, given an address containing a true (say, 3), returns the address of another true (say, 25), such that if I call the algorithm for 25, it returns 3. No storage of old choices are allowed since this algorithm will be used in a cellular automaton.

Thanks for any help.

Thanks for any help.