I am new to sage and am attempting to solve systems of multivariate
polys over GF(2).  My first attempt with a small example is

R.<a111,a112,a121,a122,b111,b112,b211,b212,c111,c112>=GF(2)[]
I=(a111 * b111 * c111 + a112 * b112 * c112 - 1 , a111 * b211 * c111 +
a112 * b212 * c112 - 0 , a121 * b111 * c111 + a122 * b112 * c112 ,
a121 * b211 * c111 + a122 * b212 * c112 - 1)*R
B= I.groebner_basis();

That works fine but how do I now solve B in sage to actually an
answer?  In my case I only need one answer rather than the full list
of possible solutions.

Also, I read back in April that there was a plan to implement
Faugere's F4 algorithm. As the systems I want to solve are very large,
I would be particularly interested in that or any related tools that
are in development. (Anyone working on an XL variant?)

Raphael


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