C21321133133313121211113313331323133313231333133313133313221221   >>    C2132113313331312121111331333132313331323133313331313331322122   <<    C21321133133313121211113313331323133313231333133313133313221223   >>      C21321133133313121211113313331323133313231333133313133313221222   >>