def parse_entity(entity_text, certainty="uncertain"):
	"""
	Parses: entity -tab- subclass(/agree) + certainty into a tuple

	:param entity_text: the string to parse, must contain excatly two tabs
	:param certainty: the certainty string at end of tuple, default 'uncertain'
	:return: quadruple of (entity, subclass, agree, certainty)
	"""
	entity, subclass, freq = entity_text.split("\t")
	if "/" in subclass:
		subclass, agree = subclass.split("/")
	else:
		agree = ""
	return (entity, subclass, agree, certainty)