A roar may fill air.Logical formLearned from18 sentences. Some roar can be from a crowd.Logical formLearned from18 sentences. A roar can be prolonged.Logical formLearned from17 sentences. A sound may pertain-to a roar.Logical formLearned from17 sentences. Heavens may disappear with a roar.Logical formLearned from17 sentences. A roar can be harsh.Logical formLearned from17 sentences. A roar may pertain-to an engine.Logical formLearned from17 sentences. A roar may pertain-to a crash.Logical formLearned from17 sentences. A crowd may respond with a roar.Logical formLearned from17 sentences. A roar can be passionate.Logical formLearned from17 sentences. A roar can be ominous.Logical formLearned from16 sentences. A roar can be constituted-of-or-filled-with voices.Logical formLearned from16 sentences. A roar can be true.Logical formLearned from16 sentences. Horse may restore a roar.Logical formLearned from16 sentences. A roar may pertain-to a waterfall.Logical formLearned from16 sentences.