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91 : 2 = 45 + 1;
45 : 2 = 22 + 1;
22 : 2 = 11 + 0;
11 : 2 = 5 + 1;
5 : 2 = 2 + 1;
2 : 2 = 1 + 0;
1 : 2 = 0 + 1;
91(10) = 101 1011(2)