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All answers having "Verdi opera" as clue:

4 Character Answers:

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AIDA



6 Character Answers:

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ATTILA

ERNANI

OTELLO



8 Character Answers:

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FALSTAFF



9 Character Answers:

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RIGOLETTO



10 Character Answers:

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LATRAVIATA



11 Character Answers:

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AMASKEDBALL

ILTROVATORE



15 Character Answers:

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SICILIANVESPERS



17 Character Answers:

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UNDISCOINMASCHERA