Knowledge may demand mastery of a (reason ..).Logical formLearned from3 sentences. A mastery can be energetic.Logical formLearned from3 sentences. Mastery may pertain-to a text.Logical formLearned from3 sentences. Mastery of a skill may be attained.Logical formLearned from3 sentences. A mastery can be interpretive.Logical formLearned from3 sentences. A mastery can be learned.Logical formLearned from3 sentences. A mastery may pertain-to a violin.Logical formLearned from3 sentences. A mastery can be in singing.Logical formLearned from3 sentences. Mastery can be on a scale.Logical formLearned from3 sentences. Mastery may undergo an understanding.Logical formLearned from3 sentences. A mastery may pertain-to a stage.Logical formLearned from3 sentences. A mastery can be accomplished.Logical formLearned from3 sentences. A mastery may pertain-to a clarinet.Logical formLearned from3 sentences. A mastery can be over a language.Logical formLearned from3 sentences. A mastery may pertain-to a brush.Logical formLearned from3 sentences.