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I tried to read it but the code sections appear very small on my screen. Almost unreadable.

But glad to learn about APL. In this video https://www.youtube.com/watch?v=rZXpgCjaxU4 he uses aplcloud.com Looked very nice but the price is very high. Can you recommend a similar free service to play with the language?

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This seems a scan from printed version and code is legible http://www.eecg.toronto.edu/%7Ejzhu/csc326/readings/iverson....

Dyalog appears to be free http://www.dyalog.com/download-zone.htm

At the bottom of their homepage there's a link to an online APL interpreter: https://tryapl.org/

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