Aspirin may prevent cancer.Logical formLearned from10 sentences. A (computer error) may prevent voters from casting ballots.Logical formLearned from10 sentences. A wreck may prevent a male from competting.Logical formLearned from10 sentences. A step may prevent collapse.Logical formLearned from10 sentences. (Security controls) may prevent bombers from reaching targets.Logical formLearned from10 sentences. A law may prevent a country from extraditting citizens.Logical formLearned from10 sentences. Arrests may prevent an attack.Logical formLearned from10 sentences. A move may prevent war.Logical formLearned from10 sentences. Persons may prevent a war.Logical formLearned from10 sentences. Weather may prevent flights.Logical formLearned from10 sentences. Countries may be involved in preventing a military action.Logical formLearned from10 sentences. A leader may prevent (terror attacks).Logical formLearned from10 sentences. Emphasis can be on preventing attacks.Logical formLearned from10 sentences. Hearings may prevent scandals.Logical formLearned from10 sentences. A country may prevent a commission from entering a camp.Logical formLearned from10 sentences.