Certain things can make COCPs not work as well:
s ɜː t ə n WORD_BOUNDARY θ ɪ ŋ z WORD_BOUNDARY k æ n WORD_BOUNDARY m eɪ k WORD_BOUNDARY k ɑ k p WORD_BOUNDARY n ɑ t WORD_BOUNDARY w ɜː k WORD_BOUNDARY æ z WORD_BOUNDARY w ɛ l WORD_BOUNDARY