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