{HEAD ~ An arch} 40 is formed in {TAIL ~ the fold} of panels 36 and 38 so as to create a downward biasing force on flaps 36 and 38, which holds flaps 36 and 38 in contact with base 32  
is formed in
{ HEAD ~ An arch } 40 is formed in { TAIL ~ the fold } of panels 36 and 38 so as to create a downward biasing force on flaps 36 and 38 , which holds flaps 36 and 38 in contact with base 32
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL 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 OTH OTH OTH