B:	it's, it's been done for quite some time.
b iː WORD_BOUNDARY ɪ t s WORD_BOUNDARY ɪ t s WORD_BOUNDARY b ɪ n WORD_BOUNDARY d ʌ n WORD_BOUNDARY f ɔ ɹ WORD_BOUNDARY k w aɪ t WORD_BOUNDARY s ʌ m WORD_BOUNDARY t aɪ m WORD_BOUNDARY