determining, based on the metagraph, {TAIL ~ another type} for another node of the given received pair of {HEAD ~ connected nodes}; and 
determining , based on the metagraph , { TAIL ~ another type } for another node of the given received pair of { HEAD ~ connected nodes } ; and
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH