! ! ! def$count_black_pixels(im):$ $$$$n,m$=$im.dim()! $$$$blacks_count$=$0$ ! ! ! ! ! ! ! ! ! ! $$$$return$blacks_count$ gen fgen next(gen) x x fgen next(gen) fgen i,j (2,2) i=j (3,2) (2,3) def$AllPairs():$ $i=0$ $while$True:$ $$$$j=0$ $$$$while$True:$ $$$$$$$$$$yield(i,j)$$ $$$$$$$$$$j=j+1$ $$$$i=i+1$ ! ! ! ! ! AllPairs() AllPairs() next next next j<i i,j) def$SomePairs():$ $i=0$ $while$True:$ $ RevGen (i,j) RevGen PairsGen PairsGen (j,i) def$RevGen(PairsGen):$ $ ! ! ! ! ! i,j AllPairs() EqPairs i,i UnionGenerators 0 UnionGenerators 0 0 def0UnionGenerators(gen1,gen2):0 0000while0True:0 0 0 0 0 0 0 0 0 0 0 AllPairs 0 def0AllPairs():0 ! ! ! ! !
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