B3311331313231311331322331333132313233313231333131333133313232223213121   >>    B331133131323131133132233133313231323331323133313133313331323222321312   <<    B3311331313231311331322331333132313233313231333131333133313232223213123   >>      B3311331313231311331322331333132313233313231333131333133313232223213122   >>