Cavities may undergo a formation.Logical formLearned from31 sentences. A central government may undergo a formation.Logical formLearned from31 sentences. A formation may pertain-to a park.Logical formLearned from31 sentences. Tropical cyclones may undergo a formation.Logical formLearned from31 sentences. An orchestra may undergo a formation.Logical formLearned from31 sentences. A section may undergo a formation.Logical formLearned from31 sentences. By-products may undergo a formation.Logical formLearned from31 sentences. Formations may pertain-to a country.Logical formLearned from31 sentences. A formation can be linear.Logical formLearned from31 sentences. Formation may fly.Logical formLearned from31 sentences. Domains may undergo a formation.Logical formLearned from31 sentences. Nuclei may undergo a formation.Logical formLearned from31 sentences. A national identity may undergo a formation.Logical formLearned from31 sentences. Formations can be younger.Logical formLearned from31 sentences. A kingdom may undergo a formation.Logical formLearned from31 sentences.