def find(self, type, number):
		crosswords = Crossword.all().filter("type =", type).filter("number =", int(number)).fetch(limit=1)
		if len(crosswords) > 0:
			return crosswords[0]
		return None
	def latest(self, type):
		crosswords = Crossword.all().filter("type =", type).order("-date").fetch(limit=1)
		if len(crosswords) > 0:
			return crosswords[0]
		return None