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C21 SmallGroup(21, 2)

[21 12 7 6]: [f2, f2^2, f1^2*f2, f2^3, f1^2*f2^2, f1*f2^3, f2^4, f2^5, f1^2*f2^4, f1*f2^5, f2^6, f1*f2^6]
             [3, 6, 7, 9, 10, 11, 12, 15, 16, 17, 18, 20]
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