The groups could be identified by their transcripts, the first group were all just three pages in length while the second group had more pages, some up to twelve.
ðə ɡɹˈuːps kʊd biː aɪdˈɛntᵻfˌaɪd baɪ ðɛɹ tɹˈænskɹɪpts, ðə fˈɜːst ɡɹˈuːp wɜːɹ ˈɔːl dʒˈʌst θɹˈiː pˈeɪdʒᵻz ɪn lˈɛŋθ wˌaɪl ðə sˈɛkənd ɡɹˈuːp hæd mˈoːɹ pˈeɪdʒᵻz, sˌʌm ˌʌp tə twˈɛlv.