It's an algorithm to find the spanning tree in decision maths. The method is:
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2x2x222
252 126,2 63,2,2 21,3,2,2 7,3,3,2,2
75 25,3 5,5,3 3 x 5 x 5 = 75
Trees aren't necessary. The greatest common multiple of any set of numbers is always infinite.
27 9,3 3,3,3 36 18,2 9,2,2 3,3,2,2 The GCF is 3 x 3, or 9.