If two radicals are the same, they can be combined. This is when both of the indexes and radicands are the same.
ɪ f WORD_BOUNDARY t uː WORD_BOUNDARY ɹ æ d ɪ k ə l z WORD_BOUNDARY ɑ ɹ WORD_BOUNDARY ð ə WORD_BOUNDARY s eɪ m WORD_BOUNDARY ð eɪ WORD_BOUNDARY k æ n WORD_BOUNDARY b iː WORD_BOUNDARY k ə m b aɪ n d WORD_BOUNDARY ð ɪ s WORD_BOUNDARY ɪ z WORD_BOUNDARY w ɛ n WORD_BOUNDARY b oʊ θ WORD_BOUNDARY ʌ v ð ɪ WORD_BOUNDARY ɪ n d ɛ k s ɪ z WORD_BOUNDARY æ n d WORD_BOUNDARY ɹ æ d ɪ k æ n d z WORD_BOUNDARY ɑ ɹ WORD_BOUNDARY ð ə WORD_BOUNDARY s eɪ m WORD_BOUNDARY