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.

Example Input: current, wave, whirlpool, sea, data sets
Example Output: data sets

Example Input: duplex, studio, flat, paved, squashed
Example Output: paved

Example Input: down, sliding, descending, emotionalities, lower
Example Output:
emotionalities