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