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44s4t2, 84s2t
Break each down to the product of primes and
single letter factors:
44s4t2 = 2·2·11·s·s·s·s·t·t
84s2t = 2·2·3·7·s·s·t
Pick all but only the factors that they have in common
which are two "2"'s, two "s"'s and 1 "t".
GCF = 2·2·s·s·t = 4s2t
Edwin