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: social gathering 
Words: meeting, cinema, club, group, submarine

SOLUTION: submarine

PROBLEM: Category: weather 
Words: fair, sunny, stormy, make the grade, variety

SOLUTION: variety

PROBLEM: Category: emotional status 
Words: pretty, comfortable, decent, fine, ok

SOLUTION:
pretty