mmroff(1) on Linux
The text 69a4a442a45c, as Debian 13 (Trixie) shipped it.
cross-referencing front end for GNU roff mm macro package
Flags it lists
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-x
The text 69a4a442a45c, as Debian 13 (Trixie) shipped it.
cross-referencing front end for GNU roff mm macro package
-x