Disasters can be in history.Logical formLearned from103 sentences. Disasters may undergo a prevention.Logical formLearned from103 sentences. A nuclear disaster can be civilian.Logical formLearned from103 sentences. Disaster may happen.Logical formLearned from102 sentences. Disasters may undergo an event.Logical formLearned from102 sentences. A disaster can be unspeakable.Logical formLearned from101 sentences. Disasters can be personal.Logical formLearned from101 sentences. A (disaster relief chief) may pertain-to a government.Logical formLearned from100 sentences. A disaster can be worse.Logical formLearned from100 sentences. A natural disaster can be in a history.Logical formLearned from100 sentences. Natural disasters may kill some persons.Logical formLearned from100 sentences. A disaster can be sudden.Logical formLearned from99 sentences. A disaster may pertain-to the world.Logical formLearned from99 sentences. A major disaster may undergo an event.Logical formLearned from99 sentences. A (tsunami disaster) may pertain-to a month.Logical formLearned from98 sentences.