B3311331313231311331322331333132313331323131323223313231211212121   >>    B331133131323131133132233133313231333132313132322331323121121212   <<    B3311331313231311331322331333132313331323131323223313231211212123   >>      B3311331313231311331322331333132313331323131323223313231211212122   >>