I see they disappeared
I see they appear
pro:sub v pro:sub part
i see they disappeared.
aɪ WORD_BOUNDARY s iː WORD_BOUNDARY ð eɪ WORD_BOUNDARY d ɪ s ʌ p ɪ ɹ d WORD_BOUNDARY
i WORD_BOUNDARY s e e WORD_BOUNDARY t h e y WORD_BOUNDARY d i s a p p e a r e d . WORD_BOUNDARY