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