1mandoc: dupe.in:3:5: STYLE: operating system explicitly specified: Os NetBSD (NetBSD)
2mandoc: dupe.in:2:5: STYLE: Mdocdate found: Dd $Mdocdate: January 19 2020 $ (NetBSD)
3mandoc: dupe.in:4:2: WARNING: prologue macros out of order: Dt after Os
4mandoc: dupe.in:5:2: ERROR: duplicate prologue macro: Os
5mandoc: dupe.in:5:5: STYLE: operating system explicitly specified: Os FreeBSD (NetBSD)
6mandoc: dupe.in:2:5: STYLE: Mdocdate found: Dd $Mdocdate: January 19 2020 $ (NetBSD)
7mandoc: dupe.in:11:2: ERROR: duplicate prologue macro: Os
8mandoc: dupe.in:11:5: STYLE: operating system explicitly specified: Os OpenBSD (NetBSD)
9mandoc: dupe.in: STYLE: RCS id missing: (NetBSD)
10