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111 - 63 = 48
63 minus 21 is 42.
111 - 87 = 24
Assuming that is binary: 1111112 = 63
189
187
It is: 63-4 = 59
111
15
91 - 63 = 28
63 - 10 = 53
100 - 63 = 37
63 - 37 = 26