D1212121212131323223313233231323331313231333131323211331323132312112321   >>    D121212121213132322331323323132333131323133313132321133132313231211232   <<    D1212121212131323223313233231323331313231333131323211331323132312112323   >>      D1212121212131323223313233231323331313231333131323211331323132312112322   >>