B3311331313231311331322331333132313233313233231333133313331323221333131232321   >>    B331133131323131133132233133313231323331323323133313331333132322133313123232   <<    B3311331313231311331322331333132313233313233231333133313331323221333131232323   >>      B3311331313231311331322331333132313233313233231333133313331323221333131232322   >>