D1212121212131323223313233231323331313231333131323211331323121121   >>    D121212121213132322331323323132333131323133313132321133132312112   <<    D1212121212131323223313233231323331313231333131323211331323121123   >>      D1212121212131323223313233231323331313231333131323211331323121122   >>