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From: honey crisis <gaztoast@gmail.com>
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Subject: Re: FIRST_k, FOLLOW_k, k>1
Date: Sat, 8 Feb 2020 18:18:03 -0800 (PST)
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Xref: csiph.com comp.compilers:2448

Antlr used to use trees (don't know if it still does) to represent its lookahead with LL(k)

This paper gets into it:
https://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=1311&context=ecetr