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