Sabotage may prevent exports.Logical formLearned from7 sentences. An issue may prevent some countries from signing a (peace treaty).Logical formLearned from7 sentences. Thousands of members of armed forces may be prevented from votting.Logical formLearned from7 sentences. Developments may prevent a visit.Logical formLearned from7 sentences. Weather may prevent an attempt.Logical formLearned from7 sentences. A (security service) may be charged with preventing attacks.Logical formLearned from7 sentences. Persons may prevent an entry.Logical formLearned from7 sentences. A female may be prevented from taking part.Logical formLearned from7 sentences. An illness may prevent a male.Logical formLearned from7 sentences. Interest can be in preventing a neighbor.Logical formLearned from7 sentences. Persons may prevent bloodshed by openning a dialogue.Logical formLearned from7 sentences. Some obstacles may prevent ties from going.Logical formLearned from6 sentences. A militia-rule may prevent ministers from carry_outing work.Logical formLearned from6 sentences. A male may be prevented from getting on a bus.Logical formLearned from6 sentences. Violence may be prevented.Logical formLearned from6 sentences.