已知文法G[Z]，其产生规则P为：Z→Be|AB|ZCA→Ae|eB→Ce|AfC→CfD→f，其压缩过文法为：AZ→Be|ABA∷=Ae|eB∷=AfBZ→Be|ABA∷=Ae|eB→Ce|AfCZ→Be|ABA∷=Ae|eDZ→Be|AB|ZCZ→Be|ABA∷=Ae|eB→Ce|Af