Mistakes can be frequent.Logical formLearned from10 sentences. Death can be frequent.Logical formLearned from10 sentences. Marriage can be frequent.Logical formLearned from10 sentences. Trains can be frequent.Logical formLearned from10 sentences. Backups of some kilometers can be frequent on some sides of a tunnel.Logical formLearned from10 sentences. (Rebel attacks) can be frequent.Logical formLearned from10 sentences. (Suicide bombings) can be frequent.Logical formLearned from10 sentences. (Bomb attacks) can be frequent.Logical formLearned from10 sentences. Heatwaves can be frequent.Logical formLearned from10 sentences. Attacks can be frequent in a (flashpoint town).Logical formLearned from10 sentences. Overflights of a country can be frequent.Logical formLearned from10 sentences. Testing can be frequent.Logical formLearned from9 sentences. Famines can be frequent.Logical formLearned from9 sentences. Exchanges can be frequent.Logical formLearned from9 sentences. Fogs can be frequent.Logical formLearned from9 sentences.