If I say
- The dog and the postman fought.
can this sentence mean that the dog and the postman fought not with each other, but each of them fought with a different creature? That is, can this sentence mean that the dog fought Jack and the postman fought Alex? Or can the original sentence mean that the postman and the dog fought Jack? Or does the original sentence necessarily imply that the postman and the dog fought with each other?
And similarly, if I say
- Alex and John talked.
can this mean that Alex talked to Mary and John talked to Sue (or that Alex and John talked to Sue)?