remove triple by supplying p,o

		Args:
			p (rdflib.term.URIRef): predicate
			o (): object
			auto_refresh (bool): whether or not to update object-like self.rdf.triples

		Returns:
			None: removes triple from self.rdf.graph

def remove_triple(self, p, o, auto_refresh=True):

		'''
		remove triple by supplying p,o

		Args:
			p (rdflib.term.URIRef): predicate
			o (): object
			auto_refresh (bool): whether or not to update object-like self.rdf.triples

		Returns:
			None: removes triple from self.rdf.graph
		'''

		self.rdf.graph.remove((self.uri, p, self._handle_object(o)))

		# determine if triples refreshed
		self._handle_triple_refresh(auto_refresh)