6*3=9 7*7=35 2*3=1 5*6=19 . . . 5*7= ?
6*3=9 >>> 5*2-1=9 7*7=35 >>> 6*6-1=35 2*3=1 >>> 1*2-1=1 5*6=19 >>> 4*5-1=19 . . . 5*7= ? >>> 4*6-1=23
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