Helicopter may crash in a country.Logical formLearned from16 sentences. A (jet fighter) may crash.Logical formLearned from16 sentences. An airline may crash in a world-city.Logical formLearned from16 sentences. A jetliner may crash in a country.Logical formLearned from16 sentences. A jet may crash in a ball of flame.Logical formLearned from16 sentences. Terrorists may crash jetliners.Logical formLearned from16 sentences. Hijackers may crash some jetliners.Logical formLearned from16 sentences. Helicopters may crash during an exercise.Logical formLearned from16 sentences. A male-person may crash into a wall.Logical formLearned from16 sentences. An airliner may crash into a mountain.Logical formLearned from16 sentences. Rockets may crash.Logical formLearned from16 sentences. An express train may crash into some train.Logical formLearned from16 sentences. A man may crash a small plane.Logical formLearned from16 sentences. A (tourist plane) may crash.Logical formLearned from16 sentences. A jet may crash in a field.Logical formLearned from16 sentences.