In this task, you are given two natural language statements with similar wording. You must choose the statement that makes less sense based on common sense knowledge. A '
' separates the statements. Use "first" or "second" to indicate which sentence makes less sense.

Q: River is flowing still while there is no water.
River is flowing down the narrow path.

A: first
****
Q: Serial killers are safe.
Serial killers are dangerous.

A: first
****
Q: Cats are commonly kept as dogs.
Cats are commonly kept as pets.

A:
first
****