o aku pernah ke sini
o aku pernah ke sini .
o WORD_BOUNDARY  a k u WORD_BOUNDARY p ɛ r n a h WORD_BOUNDARY k ə WORD_BOUNDARY s i n i WORD_BOUNDARY
o WORD_BOUNDARY a k u WORD_BOUNDARY p e r n a h WORD_BOUNDARY k e WORD_BOUNDARY s i n i WORD_BOUNDARY