C1111233133313231133133313331333133313231312111133133313233311232212121   >>    C111123313331323113313331333133313331323131211113313331323331123221212   <<    C1111233133313231133133313331333133313231312111133133313233311232212123   >>      C1111233133313231133133313331333133313231312111133133313233311232212122   >>