In 1938, the "Central Research Institute of Language and Writing of the Peoples of the USSR" began a project of designing a new Altaic Alphabet, based on the Cyrillic script. Their new alphabet consisted of all 33 Russian letters, as well as the additions of the digraph 〈Дь дь〉 and the letter 〈Ҥҥ〉, for the phonemes /d͡ʒ/ and /ŋ/, respectively. However, this was later rejected, because it could not contain for all of Altai's phonological inventory. So too, was the use of 〈Ёё〉 and 〈Юю〉 for Altai's vowels /ø~œ/ and /y/ removed.