If some Gruns are Muns and some Muns are Duns then some Gruns are definitely Dun?

Answer:

No. It could be that only the Muns who aren't Gruns are Duns.

First answer by MasgudenATZA. Last edit by MasgudenATZA. Contributor trust: 230 [recommend contributor recommended]. Question popularity: 11 [recommend question].