A libretto may be based on a comedy.Logical formLearned from2 sentences. A libretto can be a source.Logical formLearned from2 sentences. An (opera libretto) can be in some acts.Logical formLearned from2 sentences. A libretto may be adapted by a female.Logical formLearned from2 sentences. A libretto may pertain-to a name.Logical formLearned from2 sentences. A libretto can be after a writer.Logical formLearned from2 sentences. A libretto may be based on a novella.Logical formLearned from2 sentences. A libretto may be printed.Logical formLearned from2 sentences. Librettos may be used by a composer.Logical formLearned from2 sentences. A libretto may be based on an incident.Logical formLearned from2 sentences. Librettos can be for a composer.Logical formLearned from2 sentences. A libretto can be old-fashioned.Logical formLearned from2 sentences. A male may write an (opera libretto).Logical formLearned from2 sentences. A libretto may be adapted by a composer.Logical formLearned from2 sentences. A libretto may be divided.Logical formLearned from2 sentences.