{HEAD ~ Preferably one grid field} of {TAIL ~ the second grid structure} fits onto several grid fields of the first grid structure 
of
{ HEAD ~ Preferably one grid field } of { TAIL ~ the second grid structure } fits onto several grid fields of the first grid structure
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH