Grammar school sequence

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it’s A 23 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: AEIOU.

Random information on the term “AEIOU”:
AEIOU, or A.E.I.O.U., was a symbolic device utilised by the Habsburg emperors. Emperor Frederick III (1415–93), who had a fondness for mythical formulae, habitually signed buildings and objects with the acronym.[1] Frederick III did not explain its meaning at the time, though shortly before his death, he claimed it stood for (German) “Alles Erdreich ist Österreich untertan” (MKL 1890)[2] or “All the world is subject to Austria.” However other interpretations have been put forth. Most interpretations proceed on the assumption that it was meant as a political slogan, from the Latin phrases:
Taken from Wikipedia