To rule out ambiguities, Manchester codes use a "preamble". A preamble is a fixed sequence that is known beforehand.
t ə WORD_BOUNDARY ɹ uː l WORD_BOUNDARY aʊ t WORD_BOUNDARY æ m b ɪ ɡ j uː ɪ t i z WORD_BOUNDARY m æ n t̠ʃ ɛ s t ə ɹ WORD_BOUNDARY k oʊ d z WORD_BOUNDARY j uː s WORD_BOUNDARY ʌ WORD_BOUNDARY p ɹ iː æ m b ə l WORD_BOUNDARY ʌ WORD_BOUNDARY p ɹ iː æ m b ə l WORD_BOUNDARY ɪ z WORD_BOUNDARY ʌ WORD_BOUNDARY f ɪ k s t WORD_BOUNDARY s iː k w ə n s WORD_BOUNDARY ð æ t WORD_BOUNDARY ɪ z WORD_BOUNDARY n oʊ n WORD_BOUNDARY b ɪ f ɔ ɹ h æ n d WORD_BOUNDARY