I don't know which one
i don't know which one .
aɪ WORD_BOUNDARY d oʊ n t WORD_BOUNDARY n oʊ WORD_BOUNDARY w ɪ t̠ʃ WORD_BOUNDARY w ʌ n WORD_BOUNDARY
i WORD_BOUNDARY d o n ' t WORD_BOUNDARY k n o w WORD_BOUNDARY w h i c h WORD_BOUNDARY o n e WORD_BOUNDARY