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