The Cyrillic alphabet was developed in the 10th Century.
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cyrillic
...
The two monks were two brothers from Thessaloniki, Cyril and
Methodius, missionaries for the Orthodox Church, later canonized
and given the epithet isapostolos (iso-apostole :equal to the
apostoles).
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Sorry, but you've been tricked. There is no such thing as
cyrillic acid.
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bulgarian
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English speaking people use the Roman Alphabet. Russian speaking
people use the Cyrillic Alphabet. The A is the same. The B looks
different.