{TAIL ~ A seat} includes {HEAD ~ a base} having a block extended rearward for forming a pair of notches 
{ TAIL ~ A seat } includes { HEAD ~ a base } having a block extended rearward for forming a pair of notches
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH