A (license copy) may pertain-to a libretto.Logical formLearned from4 sentences. A libretto can be an one.Logical formLearned from4 sentences. A libretto may be written/wrote in a language.Logical formLearned from4 sentences. A libretto may be based on a short story.Logical formLearned from4 sentences. A copy of a libretto can be in a collection.Logical formLearned from4 sentences. An operetta can be with a libretto.Logical formLearned from4 sentences. A preface can be to a libretto.Logical formLearned from4 sentences. An author of a libretto can be unknown.Logical formLearned from4 sentences. Librettos may pertain-to a female.Logical formLearned from4 sentences. A male may write a libretto himself.Logical formLearned from4 sentences. A libretto can be for a male.Logical formLearned from4 sentences. A person may write a libretto.Logical formLearned from4 sentences. A libretto can be for an operetta.Logical formLearned from4 sentences. A text may pertain-to a libretto.Logical formLearned from4 sentences. A libretto may be set by some composers.Logical formLearned from4 sentences.