Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.
Example: excavator, crane, pelican, hoist, upraise
Example solution: pelican
Example explanation: The common category here are words related to construction. A pelican is not related to construction because it is a type of bird.

Problem: flat, mountain, even, squashed, level

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Solution: squashed