{HEAD ~ A lid sheet} is {TAIL ~ heat} sealed to the container sheet over the thermoformed containers so as to produce a pair of spaced apart, annular bead heat seals 
is
{ HEAD ~ A lid sheet } is { TAIL ~ heat } sealed to the container sheet over the thermoformed containers so as to produce a pair of spaced apart , annular bead heat seals
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL 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