B3311331313231311331322331333132313331322121133133313331333133313232311212121   >>    B331133131323131133132233133313231333132212113313331333133313331323231121212   <<    B3311331313231311331322331333132313331322121133133313331333133313232311212123   >>      B3311331313231311331322331333132313331322121133133313331333133313232311212122   >>