C231311112223313112113313231111331322331323133313233313231333133313112211212121   >>    C23131111222331311211331323111133132233132313331323331323133313331311221121212   <<    C231311112223313112113313231111331322331323133313233313231333133313112211212123   >>      C231311112223313112113313231111331322331323133313233313231333133313112211212122   >>