Premise & hypothesis.
Several bike riders compete in a competition.

The bike riders are professionals.
++++++++++
true or not.
it is not possible to tell

Premise & hypothesis.
Two dogs wearing racing equipment are running on muddy ground.

Two dogs race outside.
++++++++++
true or not.
yes

Premise & hypothesis.
Two people are playing guitar, while a third is flaying the drums.

The people are at a rock concert.
++++++++++
true or not.
it is not possible to tell