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.

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

Category: computers 
Words: ram, file, prepare, keys, format
prepare

Category: weather 
Words: make the grade, fair, unprejudiced, luke, cold

unprejudiced