A male can be on a libretto.Logical formLearned from2 sentences. A libretto can be abbreviated.Logical formLearned from2 sentences. A libretto of age may be abbreviated.Logical formLearned from2 sentences. A libretto can be by a law.Logical formLearned from2 sentences. A libretto may be found.Logical formLearned from2 sentences. A male may adapt a libretto.Logical formLearned from2 sentences. A ballet can be to a libretto.Logical formLearned from2 sentences. A libretto can be on a subject.Logical formLearned from2 sentences. A libretto may be based on a tragedy.Logical formLearned from2 sentences. A plot may pertain-to a libretto.Logical formLearned from2 sentences. An opera may be based on a libretto.Logical formLearned from2 sentences. A libretto can be by a sister.Logical formLearned from2 sentences. A libretto may be based on an episode.Logical formLearned from2 sentences. A libretto may be based on plays.Logical formLearned from2 sentences. Librettos can be successful.Logical formLearned from2 sentences.