more on commutator subgroups #3370

Job	Run time
build (supported)	2m 49s
opam-build (supported, ubuntu-latest)	2m 50s
build (latest)	2m 50s
nix	2m 23s
quick-build (supported, ubuntu-latest)	2m 47s
opam-build (latest, ubuntu-latest)	2m 49s
build (dev, --warnings)	2m 50s
quick-build (latest, ubuntu-latest)	2m 47s
opam-build (dev, ubuntu-latest)	2m 49s
quick-build (dev, ubuntu-latest)	2m 49s
doc-dep-graphs	1s
doc-coqdoc	1s
coqchk	1s
doc-alectryon	1s
doc-timing	1s
install	1s
deploy-doc	1s
delete-artifacts	7s
	27m 57s

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