{HEAD ~ Connections} between the packages themselves, and between the packages and stack connecting pads, are made on {TAIL ~ the faces} of the stack 
are made on
{ HEAD ~ Connections } between the packages themselves , and between the packages and stack connecting pads , are made on { TAIL ~ the faces } of the stack
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH