<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def random_word(size=6):
 	"""Returns a random word in lower case. 	"""

	words = shutit_assets.get_words().splitlines()
	word = ''
	while len(word) != size or "'" in word:
		word = words[int(random.random() * (len(words) - 1))]
	return word.lower()