If the operation is not permitted, then {HEAD ~ an error message} is issued at block 36, and the request for rearrangement or {TAIL ~ reallocation} of memory is aborted and terminates at block 35 
If the operation is not permitted , then { HEAD ~ an error message } is issued at block 36 , and the request for rearrangement or { TAIL ~ reallocation } of memory is aborted and terminates at block 35
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH