{HEAD ~ The coupling} of the roof to {TAIL ~ the floor}, with a rigid member, allows for both deformation of both roof and floorpan while minimizing the decrease in distance between the roof and floor 
to
{ HEAD ~ The coupling } of the roof to { TAIL ~ the floor } , with a rigid member , allows for both deformation of both roof and floorpan while minimizing the decrease in distance between the roof and floor
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH 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