{HEAD ~ The abutment structure} consists of {TAIL ~ a first element} pivoted to one of the opposing sides of the seaming board and an opposing second element pivoted to the other of the opposing sides of the seaming board 
consists of
{ HEAD ~ The abutment structure } consists of { TAIL ~ a first element } pivoted to one of the opposing sides of the seaming board and an opposing second element pivoted to the other of the opposing sides of the seaming board
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH