(Concrete barriers) may ring a perimeter.Logical formLearned from4 sentences. (Riot police) may ring a (convention arena).Logical formLearned from4 sentences. Lines may ring busy.Logical formLearned from4 sentences. Calls to an embassy may ring unanswered.Logical formLearned from4 sentences. Children may ring.Logical formLearned from4 sentences. Troops may ring a monastery.Logical formLearned from4 sentences. Banners may be ringed.Logical formLearned from4 sentences. A warning of (rocket attacks) may ring.Logical formLearned from4 sentences. Calls to a home may ring unanswered.Logical formLearned from4 sentences. A quarter may ring with a chorus of hammerings.Logical formLearned from4 sentences. Some (voting tents) may be ringed.Logical formLearned from4 sentences. A crowd may ring bells.Logical formLearned from4 sentences. Soldiers may ring a neighborhood.Logical formLearned from4 sentences. Fences may be ringed.Logical formLearned from4 sentences. (Security forces) may ring a city.Logical formLearned from4 sentences.