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2Significato: unrealdreamy intangible mythical impractical
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3Significato: idealtheoretical fanciful fantastic illusoryimpractical unreal chimerical imaginary
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4Significato: unrealizableunrealisable impracticable impracticalunworkable infeasible impossible
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5Significato: visionimaginary theoretical fanciful fantastic illusoryimpractical unreal chimerical ideal