sˈɛkənd, ɐ sʌmˈeɪʃən ˌoʊvɚ ðɪ ˈɑːd ˈɪndᵻsˌiːz bɹˈoʊkən ˌɪntʊ tˈuː pˈiːsᵻz:  ænd , ɐkˈoːɹdɪŋ tə wˈɛðɚ ðɪ ˈɪndɛks ɪz wˈʌn ɔːɹ θɹˈiː mədʒˈuːloʊ fˈoːɹ.
Second, a summation over the odd indices broken into two pieces:  and , according to whether the index is 1 or 3 modulo 4.