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The phonetic values of many of the letters are thought to have been displaced under Cyrillic influence or to have become confused through the early spread to different dialects, so the original values are not always clear. For instance, the letter yu Ⱓ is thought to have perhaps originally had the sound /u/ but was displaced by the adoption of the ligature Ⱆ under the influence of later Cyrillic , mirroring the Greek ου. Other letters were late creations after a Cyrillic model. It should also be noted that Ⱑ corresponds to two different old Cyrillic letters (Ѣ and Ꙗ), present even in older manuscripts, and not to different later variants of the same Cyrillic letter in different times or places.[citation needed]