D1212121212131323223313233231323331313231333131323211331323133112323231   >>    D121212121213132322331323323132333131323133313132321133132313311232323   <<    D1212121212131323223313233231323331313231333131323211331323133112323233   >>      D1212121212131323223313233231323331313231333131323211331323133112323232   >>