This is BibTeX, Version 0.99d (TeX Live 2022/Debian)
Capacity: max_strings=200000, hash_size=200000, hash_prime=170003
The top-level auxiliary file: main.aux
The style file: plainnat.bst
Database file #1: refs.bib
You've used 21 entries,
            2773 wiz_defined-function locations,
            766 strings with 8739 characters,
and the built_in function-call counts, 9334 in all, are:
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> -- 471
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preamble$ -- 1
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substring$ -- 389
swap$ -- 21
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write$ -- 306