A libretto may be based on a (fairy tale).Logical formLearned from2 sentences. A libretto can be in some acts.Logical formLearned from2 sentences. A male may revise a libretto.Logical formLearned from2 sentences. A libretto can be extant.Logical formLearned from2 sentences. Libretto can be by playwright.Logical formLearned from2 sentences. Differences can be from a libretto.Logical formLearned from2 sentences. A male may contribute a libretto.Logical formLearned from2 sentences. A libretto may be divided into some scenes.Logical formLearned from2 sentences. Copies may pertain-to a libretto.Logical formLearned from2 sentences. A libretto can be for a (chamber opera).Logical formLearned from2 sentences. A libretto may meet objections.Logical formLearned from2 sentences. Operas can be to librettos.Logical formLearned from2 sentences. A libretto can be unpublished.Logical formLearned from2 sentences. Libretto can be by a writer.Logical formLearned from2 sentences. Scenes may pertain-to a libretto.Logical formLearned from2 sentences.