{HEAD ~ Each} of {TAIL ~ the primary memory blocks} has a laser fuse that will disable the associated primary memory block and enable the replacement memory block such that the total amount of logical memory in the memory device is unaffected by a defective primary block 
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{ HEAD ~ Each } of { TAIL ~ the primary memory blocks } has a laser fuse that will disable the associated primary memory block and enable the replacement memory block such that the total amount of logical memory in the memory device is unaffected by a defective primary block
HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH