B331133131323131133132233133313231323133313331331123313232212121   >>    B33113313132313113313223313331323132313331333133112331323221212   <<    B331133131323131133132233133313231323133313331331123313232212123   >>      B331133131323131133132233133313231323133313331331123313232212122   >>