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If we use A,B,C in increasing order, from the stem we've got the form
Sqr (ABC) = C, so; ABC=C^2; AB=C; C=12; AB=12
As we need a product we better remain with the form:
So, we just pick numbers where A could only be 1,2,4, and 5 (remember C is the biggest number). Then A=2, B=6