C213211331333131212111133133313231333132313331322331323133313231312111132122121   >>    C21321133133313121211113313331323133313231333132233132313331323131211113212212   <<    C213211331333131212111133133313231333132313331322331323133313231312111132122123   >>      C213211331333131212111133133313231333132313331322331323133313231312111132122122   >>