I don't know how I happen to know that
i don't know how i happen to know that .
aɪ WORD_BOUNDARY d oʊ n t WORD_BOUNDARY n oʊ WORD_BOUNDARY h aʊ WORD_BOUNDARY aɪ WORD_BOUNDARY h æ p ə n WORD_BOUNDARY t ə WORD_BOUNDARY n oʊ WORD_BOUNDARY ð æ t WORD_BOUNDARY
i WORD_BOUNDARY d o n ' t WORD_BOUNDARY k n o w WORD_BOUNDARY h o w WORD_BOUNDARY i WORD_BOUNDARY h a p p e n WORD_BOUNDARY t o WORD_BOUNDARY k n o w WORD_BOUNDARY t h a t WORD_BOUNDARY