B3311331313231311331322331333132313233313231333131333133313232211233132311211   >>    B331133131323131133132233133313231323331323133313133313331323221123313231121   <<    B3311331313231311331322331333132313233313231333131333133313232211233132311213   >>      B3311331313231311331322331333132313233313231333131333133313232211233132311212   >>