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: submarine, group, club, roll, grilled cheese

SOLUTION: group

PROBLEM: Category: boats 
Words: bridge, deck, stern, dock, suits

SOLUTION: suits

PROBLEM: Category: secretary duty 
Words: support, fax, file, download, errands

SOLUTION:
download