def tok_format(tok):
	"""
	Make a summary string from a spaCy token, containing:
	 tok.orth_, which is the word[s];
	 tok.ent_id_, which is the entity id,
	 tok.dep_, which is the dependency tag
	"""
	return "_".join([tok.orth_, tok.ent_id_, tok.pos_, tok.dep_])