B3311331313231311331322331333132313233313231333131123313331323221312121   >>    B331133131323131133132233133313231323331323133313112331333132322131212   <<    B3311331313231311331322331333132313233313231333131123313331323221312123   >>      B3311331313231311331322331333132313233313231333131123313331323221312122   >>