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: animals 
Words: duck, jog, cat, pig, mallet

SOLUTION: jog

PROBLEM: Category: type of rigidity 
Words: rigged, firm, unyielding, streamline, taut

SOLUTION: streamline

PROBLEM: Category: shady activities 
Words: smuggled, smear, unwarranted, fudge, cookies

SOLUTION:
cookies