Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.

Q: duplex, studio, cabin, horizontal, flat

A: horizontal
****
Q: acceptable, mad, fine, comfortable, probation

A: probation
****
Q: parrot, tackle, winch, crane, mallet

A:
tackle
****