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