An indefinite area exists because {TAIL ~ an address space} is smaller in {HEAD ~ the parity area} than that of the normal area 
An indefinite area exists because { TAIL ~ an address space } is smaller in { HEAD ~ the parity area } than that of the normal area
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH