Premise & hypothesis.
A riot squad making their way through a crowd.

There is a riotous crowd outside.
++++++++++
true or not.
yes

Premise & hypothesis.
An elderly man stands in a rowboat on a body of water.

The person is fishing.
++++++++++
true or not.
it is not possible to tell

Premise & hypothesis.
A guy in midair with skis and a helmet with clear blue skies in background.

An Olympian is skiing.
++++++++++
true or not.
it is not possible to tell