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: aesthetic characteristic 
Words: luke, fair, variety, tone, well

SOLUTION: luke

PROBLEM: Category: alcoholic drinks 
Words: wine, rum, bridge, tonic, gin

SOLUTION: bridge

PROBLEM: Category: animal 
Words: horse, climbing, fish, iguana, shark

SOLUTION:
climbing