B3311331313231311331322331333132313231323331333131333133313232211233132313311   >>    B331133131323131133132233133313231323132333133313133313331323221123313231331   <<    B3311331313231311331322331333132313231323331333131333133313232211233132313313   >>      B3311331313231311331322331333132313231323331333131333133313232211233132313312   >>