Activities may pertain-to a mission.Logical formLearned from36 sentences. (News story) may describe a launch of a (space mission).Logical formLearned from36 sentences. Challenges may pertain-to a mission.Logical formLearned from36 sentences. A mission may pertain-to a plane.Logical formLearned from36 sentences. Missions can be urban.Logical formLearned from36 sentences. A percent may pertain-to missions.Logical formLearned from36 sentences. Enthusiasm can be for a mission.Logical formLearned from36 sentences. Some mission can be to a planet.Logical formLearned from36 sentences. A mission can be fantastic.Logical formLearned from36 sentences. A mission may pertain-to an university.Logical formLearned from36 sentences. A mission can be safe.Logical formLearned from36 sentences. Missions can be in a us-state.Logical formLearned from36 sentences. A (political mission) may pertain-to an international-political-entity.Logical formLearned from36 sentences. A helicopter may crash during a (training mission).Logical formLearned from36 sentences. A (refueling mission) may pertain-to an ocean.Logical formLearned from36 sentences.