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