The two parts of a formal designation are
ð ə WORD_BOUNDARY t uː WORD_BOUNDARY p ɑ ɹ t s WORD_BOUNDARY ə v ə WORD_BOUNDARY f ɔ ɹ m ə l WORD_BOUNDARY d ɛ z ɪ ɡ n eɪ ʃ ə n WORD_BOUNDARY ɑ ɹ WORD_BOUNDARY