Set v of ZG-generators for the submodule '
(-1+x)ea
(-1+y)eb
(-1+z)ec
(-y+z)ed
(-x+y)ee
(-x+z)ef
(-1-z)ea+(-1-x)ec+(1+x)ef
(-1-y)ea+(-1-x)eb+(1+x)ee
(-1-y-yz-yzy-yzyz-yzyzy)ea+(z+xz+zyz+xzyz+zyzyz+xzyzyz)eb+(-x-y)ed+(1-z+yz-zyz+yzyz-zyzyz)ee+(x+y+xzy+yzy+xzyzy+yzyzy)ef
(-1-z-yz-zyz-yzyz-zyzyz)eb+(-1-y-zy-yzy-zyzy-yzyzy)ec+(1+y)ed