A (choir group) may pertain-to persons.Logical formLearned from5 sentences. Problems may plague choirs.Logical formLearned from5 sentences. A choir may sing in a language.Logical formLearned from5 sentences. A rendition may pertain-to a choir.Logical formLearned from5 sentences. A (music professor) may nurture a choir.Logical formLearned from5 sentences. A choir may stand.Logical formLearned from5 sentences. A mixed choir may go on tour.Logical formLearned from5 sentences. A choir can be exuberant.Logical formLearned from5 sentences. A concert can be with a choir.Logical formLearned from5 sentences. A choir can be a chorus.Logical formLearned from5 sentences. Choirs can be at an university.Logical formLearned from5 sentences. A choir may be directed by a doctor.Logical formLearned from5 sentences. A choir may pertain-to a general.Logical formLearned from5 sentences. A choir may grow.Logical formLearned from5 sentences. (Choir boys) may pertain-to a world-city.Logical formLearned from5 sentences.