B3311331313231311331322331333132313233313231333131333133313232212121221   >>    B331133131323131133132233133313231323331323133313133313331323221212122   <<    B3311331313231311331322331333132313233313231333131333133313232212121223   >>      B3311331313231311331322331333132313233313231333131333133313232212121222   >>