A black cloud can be mysterious.Logical formLearned from5 sentences. A concern can be for clouds.Logical formLearned from5 sentences. Clouds may have an effect.Logical formLearned from5 sentences. Clouds can be with thunderstorms.Logical formLearned from5 sentences. Some clouds may be recorded.Logical formLearned from5 sentences. (Heat clouds) may pertain-to a weekday.Logical formLearned from5 sentences. (Heat clouds) may belch.Logical formLearned from5 sentences. (Heat clouds) may be knowned.Logical formLearned from5 sentences. A cloud may be released by an explosion.Logical formLearned from5 sentences. A cloud may hang over a workforce.Logical formLearned from5 sentences. (Television footage) may show a cloud of black smoke.Logical formLearned from5 sentences. Clouds can be constituted-of-or-filled-with sulphuric acid.Logical formLearned from5 sentences. A (mushroom cloud) may billow.Logical formLearned from5 sentences. The sky can be free of clouds.Logical formLearned from5 sentences. Clouds may gather over a world-city.Logical formLearned from5 sentences.