Symbols can be silent.Logical formLearned from10 sentences. (Study areas) can be silent.Logical formLearned from10 sentences. A record can be silent.Logical formLearned from10 sentences. A sufferer can be silent.Logical formLearned from10 sentences. A house may remain silent.Logical formLearned from10 sentences. A garden can be silent.Logical formLearned from10 sentences. Executives can be silent.Logical formLearned from10 sentences. Television can be silent.Logical formLearned from10 sentences. A protest can be silent.Logical formLearned from10 sentences. A telephone can be silent.Logical formLearned from10 sentences. (Phone lines) can be silent.Logical formLearned from10 sentences. A tide can be silent.Logical formLearned from10 sentences. An existence can be silent.Logical formLearned from10 sentences. An international-political-entity can be silent.Logical formLearned from10 sentences. Legislators can be silent.Logical formLearned from10 sentences.