haihai haihai haihai haihai
haihai haihai haihai haihai .
h a i h a i WORD_BOUNDARY h a i h a i WORD_BOUNDARY h a i h a i WORD_BOUNDARY h a i h a i WORD_BOUNDARY
h a i h a i WORD_BOUNDARY h a i h a i WORD_BOUNDARY h a i h a i WORD_BOUNDARY h a i h a i WORD_BOUNDARY