@JodiChan

A -m-> B

B --> C

------------

A -m-> C

ex: (P1) Most students in Prof. Snape's class can brew potions masterfully. (P2) All students who can masterfully brew potions are invited to join the Slug Club. (C) Therefore, most students in Prof. Snape's class are invited to join the Slug Club.

1. students -m-> brew

2. brew --> club

   students -m-> brew --> club

3. students -m-> club