B3311331313231311331322331333132313331323131323223313232213331323131333121   >>    B331133131323131133132233133313231333132313132322331323221333132313133312   <<    B3311331313231311331322331333132313331323131323223313232213331323131333123   >>      B3311331313231311331322331333132313331323131323223313232213331323131333122   >>