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From: Lars Brinkhoff <lars@nocrew.org>
To: John Cowan <cowan@ccil.org>
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	(John Cowan's message of "Wed, 1 Mar 2023 20:56:12 -0500")
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Subject: [TUHS] Re: Unix v7 icheck dup problem
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John Cowan <cowan@ccil.org> writes:
>>  which Rob Austein re-wrote into "Alice's PDP-10". 
> I didn't know that one was done at MIT.

This spells out the details:
https://www.hactrn.net/sra/alice/alice.glossary