An age may pertain-to a formation.Logical formLearned from48 sentences. Galaxies may undergo a formation.Logical formLearned from48 sentences. An embryo may undergo a formation.Logical formLearned from48 sentences. Culture may undergo a formation.Logical formLearned from48 sentences. Polymers may undergo a formation.Logical formLearned from48 sentences. Working groups may undergo a formation.Logical formLearned from48 sentences. A formation can be subject.Logical formLearned from48 sentences. Soldiers may march in formation.Logical formLearned from48 sentences. A brigade may undergo a formation.Logical formLearned from48 sentences. A formation can be elite.Logical formLearned from48 sentences. (Rock formations) can be cretaceous.Logical formLearned from47 sentences. Some years can be after a formation.Logical formLearned from47 sentences. (Rock formations) can be dramatic.Logical formLearned from47 sentences. A world may undergo a formation.Logical formLearned from47 sentences. A formation can be preferred.Logical formLearned from47 sentences.