{HEAD ~ The step} of forming fin structures forms fin structures adjacent to {TAIL ~ the recessed sidewalls} 
{ HEAD ~ The step } of forming fin structures forms fin structures adjacent to { TAIL ~ the recessed sidewalls }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL