Heavy rains may wreak havoc.Logical formLearned from13 sentences. Havoc may take place on a month.Logical formLearned from12 sentences. Bill may wreak havoc.Logical formLearned from12 sentences. Terrorism may use havoc.Logical formLearned from12 sentences. Hurricanes may wreak havoc.Logical formLearned from12 sentences. An invader may wreak havoc.Logical formLearned from12 sentences. A storm may wreak havoc.Logical formLearned from12 sentences. Mudslides may wreak havoc.Logical formLearned from12 sentences. Flooding may wreak havoc.Logical formLearned from12 sentences. An increase may wreak havoc on farmers.Logical formLearned from12 sentences. Weapons may wreak havoc.Logical formLearned from12 sentences. A trail can be constituted-of-or-filled-with havoc.Logical formLearned from12 sentences. Deflation may wreak havoc on the economy.Logical formLearned from12 sentences. A crisis may wreak havoc.Logical formLearned from12 sentences. A world-city may wreak havoc.Logical formLearned from12 sentences.