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: chocolate food 
Words: cake, fudge, rich, invent, cream

SOLUTION: invent

PROBLEM: Category: poker 
Words: fold, deck, board, call, knockout

SOLUTION: knockout

PROBLEM: Category: shady activities 
Words: fudge, mangle, falsehood, falsification, cake

SOLUTION:
cake