A multivariate polynomial over small finite field
set by setmod_ff(p,n) can be factorized by
using a builtin function sffctr(). modfctr()
also factorizes a polynomial over a finite prime field.
Internally, modfctr() creates a sufficiently large
field extension of the specified ground field, and
it calls sffctr(), then it constructs irreducible
factors over the ground field from the factors returned by
sffctr().
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