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Thank-you. Any thoughts on the layout below versus the others listed?

https://www.pckeyboard.com/page/product/USAPLSET

I've got some notes on setting up input on OpenBSD as well. It enables Left Ctrl and Left Alt for APL symbols, but also a Unicode escape hatch with Right Alt and Caps Lock: https://github.com/turtleyacht/ap-el-kb.github.io

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It looks to be the standard Dyalog APL keyset, which will be just fine for GnuAPL and most if not all APLs but not all languages of the APL family.
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huh, can you not use the Xkb APL symbols file?

I thought that compose definitions as well as the shifted layout…

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You can and most do but some people go other routes for one reason or another.

https://aplwiki.com/wiki/Typing_glyphs

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