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The GCF is 21.
The GCF is 13.
The GCF is 63.
The GCF is 3.
The GCF is 7.
The GCF for 91 63 is 7.
The GCF of 1 and 91 is 1. The GCF of 91 and 91 is 91.
The GCF is: 63
91 - 63 = 28
The GCF is 1.