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: walk, flap, fish, fly, bats

SOLUTION: flap

PROBLEM: Category: bird 
Words: flamingo, crane, neck, ostrich, davit

SOLUTION: davit

PROBLEM: Category: aesthetic characteristic 
Words: there, happy, dull, attractive, fine

SOLUTION:
happy