Leo: Premise: "A swimmer wearing a black hat and goggles is doing the butterfly stroke."
Based on this premise, can we conclude that the hypothesis "Someone is swimming." is true?
Options:
- yes
- it is not possible to tell
- no
Mei: OK, So, let's think first...
Me:
A swimmer is someone and doing a butterfly stroke is a part of swimming.
Thus, the answer is yes.