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