D23211331312323132313232213231323113313223313113313232211221123122311   >>    D2321133131232313231323221323132311331322331311331323221122112312231   <<    D23211331312323132313232213231323113313223313113313232211221123122313   >>      D23211331312323132313232213231323113313223313113313232211221123122312   >>