Persons may leave an era.Logical formLearned from10 sentences. Fossils can be from an era.Logical formLearned from10 sentences. A beginning may pertain-to a present era.Logical formLearned from10 sentences. An era may pertain-to an administration.Logical formLearned from10 sentences. Music can be from eras.Logical formLearned from10 sentences. Parts may pertain-to an era.Logical formLearned from10 sentences. An era can be in 1950s.Logical formLearned from10 sentences. An era may pertain-to a competition.Logical formLearned from10 sentences. A level may pertain-to an era.Logical formLearned from10 sentences. An era may pertain-to a series.Logical formLearned from10 sentences. Coins may pertain-to an era.Logical formLearned from10 sentences. Hallmarks may pertain-to an era.Logical formLearned from10 sentences. An era may pertain-to a monarchy.Logical formLearned from10 sentences. An era can be constituted-of-or-filled-with depression.Logical formLearned from10 sentences. An end may pertain-to a big-band era.Logical formLearned from10 sentences.