C11111211113313112113313331333133313231323223313231333132312121121   >>    C1111121111331311211331333133313331323132322331323133313231212112   <<    C11111211113313112113313331333133313231323223313231333132312121123   >>      C11111211113313112113313331333133313231323223313231333132312121122   >>