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## Polynomials on small finite fields

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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