vem cá vem cá vem cá vem cá
vem cá vem cá vem cá vem cá .
v ẽ WORD_BOUNDARY k a WORD_BOUNDARY v ẽ WORD_BOUNDARY k a WORD_BOUNDARY v ẽ WORD_BOUNDARY k a WORD_BOUNDARY v ẽ WORD_BOUNDARY k a WORD_BOUNDARY
v e m WORD_BOUNDARY c á WORD_BOUNDARY v e m WORD_BOUNDARY c á WORD_BOUNDARY v e m WORD_BOUNDARY c á WORD_BOUNDARY v e m WORD_BOUNDARY c á WORD_BOUNDARY . WORD_BOUNDARY