4 words for EU 1–2 letters

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1 letter (2)

e u
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Alphabet (Z–A)
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2 letters (2)

eu ue
E.g. Puccini’s Che gelida manina
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A
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R
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I
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A
Hint 1 meaning
An air or song; a melody; a tune.
Hint 2 anagram
AARI
Hint 3 another clue
Solo
31 +2