{HEAD ~ A memory cell} of an SRAM has two drive MISFETs and {TAIL ~ two vertical MISFETs} 
{ HEAD ~ A memory cell } of an SRAM has two drive MISFETs and { TAIL ~ two vertical MISFETs }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL