v

Set v of ZG-generators for the submodule '

(-1+x)e_a

(1-xyx)e_b+(-1+x-y+yx)e_c

(1-y)e_a+(1-yx-xyx²+xyxy)e_c

(1+y)e_a +(-x²-x³-xyx-yx²-x²yx-xyx²)e_b+(x²+x²y+xyx+yx²+xyxy+yx²y)e_c