C21321133133313121211113313331323133313231333132233132313331333132313121121   >>    C2132113313331312121111331333132313331323133313223313231333133313231312112   <<    C21321133133313121211113313331323133313231333132233132313331333132313121123   >>      C21321133133313121211113313331323133313231333132233132313331333132313121122   >>