Some formations of (enemy warplanes) may violate airspace.Logical formLearned from46 sentences. A formation can be an unit of age.Logical formLearned from46 sentences. A squadron may undergo a formation.Logical formLearned from46 sentences. An empire may undergo a formation.Logical formLearned from46 sentences. A regiment may undergo a formation.Logical formLearned from46 sentences. A battalion may undergo a formation.Logical formLearned from46 sentences. Opposition may undergo a formation.Logical formLearned from46 sentences. A person may undergo a formation.Logical formLearned from46 sentences. Formation may undergo an understanding.Logical formLearned from46 sentences. Conscience may undergo a formation.Logical formLearned from46 sentences. A (blood cell formation) can be red.Logical formLearned from46 sentences. Ones may undergo a formation.Logical formLearned from46 sentences. A cell may undergo a formation.Logical formLearned from46 sentences. A (minority government) may undergo a formation.Logical formLearned from46 sentences. A football-association may undergo a formation.Logical formLearned from45 sentences.