B3311331313231311331322331333132333132332113313331333133313233313232213111   >>    B331133131323131133132233133313233313233211331333133313331323331323221311   <<    B3311331313231311331322331333132333132332113313331333133313233313232213113   >>      B3311331313231311331322331333132333132332113313331333133313233313232213112   >>