B3311331313231311331322331333132233131133132233133313231333131133132233313121   >>    B331133131323131133132233133313223313113313223313331323133313113313223331312   <<    B3311331313231311331322331333132233131133132233133313231333131133132233313123   >>      B3311331313231311331322331333132233131133132233133313231333131133132233313122   >>