{HEAD ~ The first and second active patterns} are formed by crystallizing an amorphous silicon thin film into {TAIL ~ a polycrystalline silicon thin film} 
{ HEAD ~ The first and second active patterns } are formed by crystallizing an amorphous silicon thin film into { TAIL ~ a polycrystalline silicon thin film }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL