A semiconductor wafer comprises substantially isolated chips, and {HEAD ~ the isolated chip} comprises {TAIL ~ a main area} 10 defined by first scribe lines 12 extending in a first direction and second scribe lines 14 extending in a second direction 
comprises
A semiconductor wafer comprises substantially isolated chips , and { HEAD ~ the isolated chip } comprises { TAIL ~ a main area } 10 defined by first scribe lines 12 extending in a first direction and second scribe lines 14 extending in a second direction
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL 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