# your code goes here
l=[[1, 2, 3], [4, 5, 6], [7, 9, 9]]
replacer=iter([1,5])
l=[[item if item!=9 else next(replacer) for item in group] for group in l]
print l
#l配列の9を1に置き換えたい
#l配列の9を5に置き換えたい
#l[2][1]を1にl[2][2]を5に置き換えて
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