B3311331313231311331322331333132313331323133211331333133313223311212121   >>    B331133131323131133132233133313231333132313321133133313331322331121212   <<    B3311331313231311331322331333132313331323133211331333133313223311212123   >>      B3311331313231311331322331333132313331323133211331333133313223311212122   >>