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by pjmlp 1072 days ago
It started like this,

"Although we entertained occasional thoughts about implementing one of the major languages of the time like Fortran, PL/I, or Algol 68, such a project seemed hopelessly large for our resources: much simpler and smaller tools were called for. All these languages influenced our work, but it was more fun to do things on our own."

-- https://www.bell-labs.com/usr/dmr/www/chist.html

Then source tapes with an almost symbolic license price for its time, and a commentary book did the rest.