On 10/30/17, Dave Horsfall <dave(a)horsfall.org> wrote:
I'm glad that I'm not the only one who remembers TECO; a fun game was to
type your name at it to see what it did.
Stan Rabinowitz once asked a question in DEC's Trivia NOTES
conference: "What do these two-character sequences have in common?"
There followed four sets of two special characters. The answer was
that those were the only two-character sequences that were NOT valid
TECO commands.
-Paul W.