{HEAD ~ Each substrate} has {TAIL ~ a first edge} and a second edge orthogonal with the first edge 
has
{ HEAD ~ Each substrate } has { TAIL ~ a first edge } and a second edge orthogonal with the first edge
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH