deroff(1) on OpenBSD
The text c730208548f3, as OpenBSD 4.8, OpenBSD 4.7, OpenBSD 4.6, OpenBSD 4.5, OpenBSD 4.4, OpenBSD 4.3, OpenBSD 4.2 shipped it.
remove nroff/troff, eqn, pic and tbl constructs
Flags it lists
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-i -
-k -
-m -
-p -
-w