B3311331313231311331322331333132313331322331323133313331333231333133312121   >>    B331133131323131133132233133313231333132233132313331333133323133313331212   <<    B3311331313231311331322331333132313331322331323133313331333231333133312123   >>      B3311331313231311331322331333132313331322331323133313331333231333133312122   >>