A return may pertain-to an era.Logical formLearned from13 sentences. A tragedy may pertain-to an era.Logical formLearned from13 sentences. (Security challenges) may pertain-to an era.Logical formLearned from13 sentences. Policy can be in an era.Logical formLearned from13 sentences. Guns may pertain-to an era.Logical formLearned from13 sentences. An era may undergo a transformation.Logical formLearned from13 sentences. An era may pertain-to a military-or-other-action-organization.Logical formLearned from13 sentences. A new era can be constituted-of-or-filled-with molecular medicine.Logical formLearned from13 sentences. An era may be forgot.Logical formLearned from13 sentences. An era can be constituted-of-or-filled-with demands.Logical formLearned from13 sentences. A player can be from an era.Logical formLearned from13 sentences. Practices may pertain-to an era.Logical formLearned from13 sentences. An era can be distant.Logical formLearned from13 sentences. Eras may pertain-to a band.Logical formLearned from13 sentences. A tribute can be to an era.Logical formLearned from13 sentences.