Premise & hypothesis.
Kids playing accordions by a railing.

The children are practicing a duet for a upcoming performance.
++++++++++
true or not.
it is not possible to tell

Premise & hypothesis.
A guy wearing a helmet and red shirt is doing an air stunt on a bicycle.

The man performs tricks on his bicycle.
++++++++++
true or not.
yes

Premise & hypothesis.
A man in a yellow jacket and blue helmet is riding his bicycle on a sidewalk.

There is a man.
++++++++++
true or not.
yes