A spread may pertain-to an (ash cloud).Logical formLearned from12 sentences. An (air travel chaos) may be caused by an (ash cloud).Logical formLearned from12 sentences. (Airline losses) can be from an (ash cloud).Logical formLearned from12 sentences. Clouds of black smoke may billow into air.Logical formLearned from12 sentences. A cloud can be heavenly.Logical formLearned from12 sentences. Divisions may cast a cloud.Logical formLearned from12 sentences. A cloud can be over an industry.Logical formLearned from12 sentences. A cloud can be over a meeting.Logical formLearned from12 sentences. Failure may throw a cloud.Logical formLearned from12 sentences. A cloud can be over a meeting of ministers.Logical formLearned from12 sentences. A cloud can be tall.Logical formLearned from12 sentences. Attacks may cast a cloud.Logical formLearned from12 sentences. A cloud can be dense.Logical formLearned from12 sentences. A future can be under a cloud.Logical formLearned from12 sentences. Some towers may collapse in clouds of smoke.Logical formLearned from12 sentences.