Conclusions:

I. Some cats are dogs.

II. At least some rats are birds.

III. All rats being cats is a possibility.

Statements:

I. Some birds are dogs. Some dogs are rats. Some rats are cats.

II. All birds are rats. Some rats are cats. No dog is rat.

III. All birds are rats. All rats are dogs. No dog is cat.

IV. Some birds are rats. Some rats are dogs. No dog is cat.

V. Some birds are rats. Some rats are dogs. Some dogs are cats.