Basic idea: every two into one
For example, 1+1=10; 1+10=11; 10+10=100; 1+11=100; 10+11=101;
For example, 1 (2) = 1 (10)
10 (binary) = 2 (decimal)
11 (binary) = 3 (decimal)
100 (binary) = 4 (decimal)
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