4 words for IQ 1–2 letters

Filter answers for the "iq" by length:
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1 letter (2)

i q
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Alphabet (Z–A)
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2 letters (2)

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