A cloud of smoke may roil into a (winter sky).Logical formLearned from9 sentences. (Heat clouds) can be constituted-of-or-filled-with gas.Logical formLearned from9 sentences. A bulk may pertain-to a cloud.Logical formLearned from9 sentences. Disruption may be caused by an (ash cloud).Logical formLearned from9 sentences. An (ash cloud) can be from a volcano.Logical formLearned from9 sentences. Effects may pertain-to an (ash cloud).Logical formLearned from9 sentences. Passengers may be stranded by an (ash cloud).Logical formLearned from9 sentences. An (ash cloud) may move.Logical formLearned from9 sentences. (Storm clouds) may hang over the global economy.Logical formLearned from9 sentences. (Television footage) may show a cloud of smoke.Logical formLearned from9 sentences. Clouds of smoke may spew into the sky.Logical formLearned from9 sentences. A silver lining can be to clouds.Logical formLearned from9 sentences. Some clouds can be constituted-of-or-filled-with debris.Logical formLearned from9 sentences. (Cloud cover) can be in an area.Logical formLearned from9 sentences. Clouds can be to part.Logical formLearned from9 sentences.