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