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: bird 
Words: digger, heron, crane, mallet, sandpiper

SOLUTION: digger

PROBLEM: Category: aesthetic characteristic 
Words: fair, unprejudiced, level, tone, milky

SOLUTION: unprejudiced

PROBLEM: Category: secretary duty 
Words: space, prepare, make coffee, file, support

SOLUTION:
space