For example, {HEAD ~ the gate structures} include {TAIL ~ a gate stack} that has a gate dielectric and a gate electrode, offset spacers, and main spacers 
include
For example , { HEAD ~ the gate structures } include { TAIL ~ a gate stack } that has a gate dielectric and a gate electrode , offset spacers , and main spacers
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