{HEAD ~ The delta structures} 200 have {TAIL ~ a lattice} 210 of interconnected strands which intersect to define a plurality of cells 220 
have
{ HEAD ~ The delta structures } 200 have { TAIL ~ a lattice } 210 of interconnected strands which intersect to define a plurality of cells 220
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH