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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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