A performance can be by a choir.Logical formLearned from28 sentences. A choir can be combined.Logical formLearned from28 sentences. Choirs may sing.Logical formLearned from28 sentences. A choir can be black.Logical formLearned from28 sentences. A leader may pertain-to a choir.Logical formLearned from27 sentences. A choir can be from a country.Logical formLearned from27 sentences. A choir can be beautiful.Logical formLearned from27 sentences. A choir may pertain-to a philharmonic-chamber.Logical formLearned from26 sentences. A home may pertain-to a choir.Logical formLearned from26 sentences. A choir may take part.Logical formLearned from26 sentences. A tour may pertain-to a choir.Logical formLearned from26 sentences. A choir may pertain-to an university-chamber.Logical formLearned from26 sentences. A wife can be in a choir.Logical formLearned from26 sentences. Choirs may pertain-to children.Logical formLearned from26 sentences. A male can be (choir boy).Logical formLearned from25 sentences.