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Possible. These kinds of templates were the standard tool for drawing engineering schematic symbols (like transistors or logic gates) before CAD.

Draftsmen used to practice freehand lettering. The end result, without stencils, looked indistinguishable from print.

The whole thing is probably done by hand and Ritchie just had excellent handwriting.

It would be hard to beat Edger Dijkstra's handwriting. See e.g. the one numbered 831, where he explains the naturalness of zero-indexing [0].

What a joy to parse!

It’s…

I have horrible handwriting that I’ve never been ashamed of. Now I am.

Thanks for posting this!