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Recursive golf solution in Creative category for Pearls in the Box by DiZ
checkio=P=lambda s,n:sum(s.count(m)*(m=='w'if n<2 else
P(~-s.count(m)*m+-~s.count(p)*p,n-1))for m,p in('wb','bw'))/len(s)
Feb. 13, 2015
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