A male may write an (opera libretto).Logical formLearned from3 sentences. A libretto may be written/wrote by scribe.Logical formLearned from3 sentences. Libretto can be from a novel-in-verse.Logical formLearned from3 sentences. A libretto may be based on a comedy.Logical formLearned from3 sentences. Popular songs may be specified in a libretto.Logical formLearned from3 sentences. An opera can be to a libretto.Logical formLearned from3 sentences. Libretto can be by fides.Logical formLearned from3 sentences. A libretto can be for work.Logical formLearned from3 sentences. Libretto can be by author.Logical formLearned from3 sentences. A basis can be for a libretto.Logical formLearned from3 sentences. An authorship may pertain-to a libretto.Logical formLearned from3 sentences. A libretto can be by a wife.Logical formLearned from3 sentences. A tone may pertain-to a libretto.Logical formLearned from3 sentences. A person may collaborate on a libretto.Logical formLearned from3 sentences. A libretto can be a collaboration.Logical formLearned from3 sentences.