A collision may kill dinosaurs.Logical formLearned from6 sentences. Collisions can be periodic.Logical formLearned from6 sentences. Taxation may undergo a collision.Logical formLearned from6 sentences. A (collision course) can be with earth.Logical formLearned from6 sentences. A study can be in a collision of cultures.Logical formLearned from6 sentences. Events may start with a collision of some particles of matter.Logical formLearned from6 sentences. A collision can be between a (space station).Logical formLearned from6 sentences. Collisions can be between (light trucks).Logical formLearned from6 sentences. Some collisions may produce electrons.Logical formLearned from6 sentences. A maneuver may set a government on a (collision course).Logical formLearned from6 sentences. A collision can be with a (cargo capsule).Logical formLearned from6 sentences. Details can be on a (space station collision).Logical formLearned from6 sentences. A national-agency may concentrate on preventing collisions.Logical formLearned from6 sentences. Some percent of crashes may be caused by collisions.Logical formLearned from6 sentences. Some persons may be killed in collisions.Logical formLearned from6 sentences.