TASK DEFINITION: Given a category and a set of five words, find the word from the set that does not belong (i.e. is the least relevant) with the other words in the category. Words are separated by commas.
PROBLEM: Category: animal 
Words: flutter, swim, ant, fly, bats

SOLUTION: flutter

PROBLEM: Category: animal 
Words: waggle, drive, fly, bee, dive

SOLUTION: drive

PROBLEM: Category: type of rigidity 
Words: alignment, taut, inflexible, firm, rough

SOLUTION:
alignment