C1111133313331323223313331333133313231333132332131333133312111111212121   >>    C111113331333132322331333133313331323133313233213133313331211111121212   <<    C1111133313331323223313331333133313231333132332131333133312111111212123   >>      C1111133313331323223313331333133313231333132332131333133312111111212122   >>