A mid-air collision may result from an accumulation of circumstances.Logical formLearned from4 sentences. Duty can be at a time of a mid-air collision.Logical formLearned from4 sentences. A collision can be between a microbus.Logical formLearned from4 sentences. An owner can be at a time of a collision.Logical formLearned from4 sentences. Some collision can be on a track.Logical formLearned from4 sentences. A collision may cost a commander a career.Logical formLearned from4 sentences. A (collision course) can be with an auhthority.Logical formLearned from4 sentences. A (collision course) can be toward confrontation.Logical formLearned from4 sentences. A (refugee boat) may sink after a collision.Logical formLearned from4 sentences. Refugees can be in a collision.Logical formLearned from4 sentences. A mid-air collision can be between some (passenger aircraft).Logical formLearned from4 sentences. A scientist may offer scientists views of a collision of galaxies.Logical formLearned from4 sentences. A survey may be conducted before a collision of some helicopters.Logical formLearned from4 sentences. A collision of some helicopters may kill some soldiers.Logical formLearned from4 sentences. A (collision avoidance alarm) may sound.Logical formLearned from4 sentences.