C123132112322333121111113121111331333133313231333133311223323211231213133212321   >>    C12313211232233312111111312111133133313331323133313331122332321123121313321232   <<    C123132112322333121111113121111331333133313231333133311223323211231213133212323   >>      C123132112322333121111113121111331333133313231333133311223323211231213133212322   >>