Dual doesn't really help in this case. In a dual system, we would have something like: 1 pant 2 pantx 3+ pants The problem with the words op is describing i

Dual doesn't really help in this case. In a dual system, we would have something like: 1 pant 2 pantx 3+ pants The problem with the words op is describing is that they should, semantically, belong to the category of 1 object, but morphologically (and syntactically) belong to the category of not-1 object. Adding a separate category for 2 objects does not address this.