考虑下面的各组谓词是否可匹配合一?蕌 pre("obl","ob2”,Z)蕌 prel("obl″,"ob3″,Y)潼 prel("obl","ob2″,z)蕌 pre("ob1"”,X,"ob3") pre("obl"”,"ob2”,Z)蕌 prel(obl",X,Y)