A problem of a century can be a problem of a color-line.Logical formLearned from13 sentences. A life may pertain-to centuries.Logical formLearned from13 sentences. A century may undergo (transportation challenges).Logical formLearned from13 sentences. Persons may step into a century.Logical formLearned from13 sentences. A political philosopher may pertain-to a century.Logical formLearned from13 sentences. A span can be constituted-of-or-filled-with centuries.Logical formLearned from13 sentences. A leap can be into a century.Logical formLearned from13 sentences. Roots can be in a nineteenth century.Logical formLearned from13 sentences. Efforts may pertain-to a century.Logical formLearned from13 sentences. A continental-region can be in a century.Logical formLearned from13 sentences. Survival can be in a century.Logical formLearned from13 sentences. Industrial revolutions may pertain-to centuries.Logical formLearned from13 sentences. Centuries can be in a making.Logical formLearned from13 sentences. Leadership can be in a century.Logical formLearned from13 sentences. Visionaries may pertain-to a century.Logical formLearned from13 sentences.