C213211331333131212111133133313231333132313331322331323133313231232221   >>    C21321133133313121211113313331323133313231333132233132313331323123222   <<    C213211331333131212111133133313231333132313331322331323133313231232223   >>      C213211331333131212111133133313231333132313331322331323133313231232222   >>