I am new in reply.it which I am now starting to explore. I arrived here through the very interesting https://repl.it/@paulgraham/repeat repl.
This program is written in Basic (beta) - pg-basic and this language in the subject of my question. Which dialect of BASIC is Basic (beta) - pg-basic? I searched for information first on repl.it and then on the Web, and I did not find anything. Here https://en.wikipedia.org/wiki/List_of_BASIC_dialects, for instance, we don't find it listed.