hello hello 謙謙
hello hello him1him1
co co n:prop
hello hello 謙謙 .
 WORD_BOUNDARY  WORD_BOUNDARY h i˥ m h i˥ m WORD_BOUNDARY
h e l l o WORD_BOUNDARY h e l l o WORD_BOUNDARY 謙 謙 WORD_BOUNDARY . WORD_BOUNDARY