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.

A person who is studying at a university or other place is called student
A person who is studying at a university or other place is called teacher
second

It's important to scratch before rigorous exercise.
It's important to stretch before rigorous exercise.
first

You are likely to find rivers in a library
You are likely to find books in a library

first