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: emotional status 
Words: kind, down, sad, backward, emotionalities

SOLUTION: backward

PROBLEM: Category: military rank 
Words: general, fighter, normal, major, lieutenant

SOLUTION: normal

PROBLEM: Category: widespread 
Words: boring, common, soldier, general, average

SOLUTION:
soldier