C21321133133313121211113313331323133313231333132233132313221231   >>    C2132113313331312121111331333132313331323133313223313231322123   <<    C21321133133313121211113313331323133313231333132233132313221233   >>      C21321133133313121211113313331323133313231333132233132313221232   >>