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: type of sandwich 
Words: club, roll, doorstep, discothek, toast

SOLUTION: discothek

PROBLEM: Category: emotional status 
Words: down, remorseful, up, emotional supports, shameful

SOLUTION: up

PROBLEM: Category: shady activities 
Words: banned, replace, smear, chocolate cake, fudge

SOLUTION:
chocolate cake