Set v of ZG-generators for the submodule '

(-1+y)eb

(-1+xy)ec

(-1-y-xy-y2-xy2-y3-xy3-y4-xy4-y5-xy5-y6-xy6)ea +(-1-x)eb +(1+x+yx+xyx+y2x+xy2x+y3x+xy3x+y4x+xy4x+y5x+xy5x+y6x)ec

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