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: variety, fair, alright, pale, flaxen

SOLUTION: alright

PROBLEM: Category: outdoor sport activity 
Words: swim, wrestle, fish, canyoning, horse

SOLUTION: horse

PROBLEM: Category: employment activity 
Words: promote, remove, heat, sack, fire

SOLUTION:
heat