I cannot thank you enough. Josh Cheek rocks. Thanks also to Steve 
Klabnik.

I thought I had tried  < require './tr' >  last night and it didn't 
work. It unquestionably does work this morning.

Scrolling up in the terminal window, which is still running, I see I did 
try it last night and got error messages. I cannot explain that, but at 
least it works now.

Thanks again.

Back to watching Josh's videos.

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