Dark clouds can be constituted-of-or-filled-with uncertainty.Logical formLearned from7 sentences. A cloud can be damp.Logical formLearned from7 sentences. A cloud can be constituted-of-or-filled-with sarin.Logical formLearned from7 sentences. Clouds of smoke may appear over a complex.Logical formLearned from7 sentences. A law may leave a cloud of uncertainty.Logical formLearned from7 sentences. Clouds can be late.Logical formLearned from7 sentences. (Thick clouds) of black smoke may billow over a city.Logical formLearned from7 sentences. Hillsides may be enveloped in cloud.Logical formLearned from7 sentences. An (ash cloud) may be caused by winds.Logical formLearned from7 sentences. A return may pertain-to an (ash cloud).Logical formLearned from7 sentences. A cloud of ash may sweep_in from an icelandic volcano.Logical formLearned from7 sentences. An icelandic volcano may spew a cloud of ash.Logical formLearned from7 sentences. An (ash cloud) may paralyse (air traffic).Logical formLearned from7 sentences. An (ash cloud) may reach a country.Logical formLearned from7 sentences. An (ash cloud) may pass.Logical formLearned from7 sentences.