{TAIL ~ Wall} 31 has formed therein a hole 32 bounded by {HEAD ~ a circumferential margin} 33 provided by wall 31 
{ TAIL ~ Wall } 31 has formed therein a hole 32 bounded by { HEAD ~ a circumferential margin } 33 provided by wall 31
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH