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diff --git a/regress/mdoc/Bl/column.in b/regress/mdoc/Bl/column.in
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+.Dd October 14, 2015
+.Dt BL-COLUMN 1
+.Os OpenBSD
+.Sh NAME
+.Nm Bl-column
+.Nd lists with multiple columns
+.Sh DESCRIPTION
+.Bl -column "a"
+.It a
+.El
+.Bl -column "a" "b"
+.It a Ta b
+.El
+.\" avoid "c" which means "cm"
+.Bl -column "a" "b" "cc"
+.It a Ta b Ta cc
+.It a	b	cc
+.It "a"	b	cc
+.It "a	b"	cc
+.It "a	b	cc"
+.El
+.Bl -column "a" "b" "cc" "d"
+.It a Ta b Ta cc Ta d
+.El
+.Bl -column "a" "b" "cc" "d" "e"
+.It a Ta b Ta cc Ta d Ta e
+.El
+.\" Probing up to the utter limits of groff.
+.\" With more than 5 columns or more than 78 characters per line,
+.\" groff .Bl -column turns completely mad.
+.\" mandoc can do more, but it's no use testing that.
+.Bd -literal
+5 + 35 + 4 + 34 = 78:
+.Ed
+.Bl -column "x35xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"  "x34xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
+.It          x35xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Ta x34xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+.It a Ta b
+.El
+.Bd -literal
+5 + (22+4)*2 + 21 = 78:
+.Ed
+.Bl -column "x22xxxxxxxxxxxxxxxxxxx"  "x22xxxxxxxxxxxxxxxxxxx"  "x21xxxxxxxxxxxxxxxxxx"
+.It          x22xxxxxxxxxxxxxxxxxxx Ta x22xxxxxxxxxxxxxxxxxxx Ta x21xxxxxxxxxxxxxxxxxx
+.It a Ta b Ta c
+.El
+.Bd -literal
+5 + 16 + (4+15)*3 = 78:
+.Ed
+.Bl -column "x16xxxxxxxxxxxxx"  "x15xxxxxxxxxxxx"  "x15xxxxxxxxxxxx"  "x15xxxxxxxxxxxx"
+.It          x16xxxxxxxxxxxxx Ta x15xxxxxxxxxxxx Ta x15xxxxxxxxxxxx Ta x15xxxxxxxxxxxx
+.It a Ta b Ta c Ta d
+.El
+.Bd -literal
+5 + 13 + (3+12)*4 = 78:
+.Ed
+.Bl -column "x13xxxxxxxxxx"  "x12xxxxxxxxx"  "x12xxxxxxxxx"  "x12xxxxxxxxx"  "x12xxxxxxxxx"
+.It          x13xxxxxxxxxx Ta x12xxxxxxxxx Ta x12xxxxxxxxx Ta x12xxxxxxxxx Ta x12xxxxxxxxx
+.It a Ta b Ta c Ta d Ta e
+.El
+.\" Trailing white space in phrases.
+.Bl -column "aaaa" "bbbb"
+.It "a" Ta "b"
+.It "a " Ta "b"
+.It "a  " Ta "b"
+.It a	b
+.It a 	b
+.It a  	b
+.El
+.\" Wrong number of columns.
+.Bl -column "a" "b"
+.It "a"
+.It "a" Ta "b"
+.It "a" Ta "b" Ta "c"
+.It "a" Ta "b" Ta "c" Ta "d"
+.It "a" Ta "b" Ta "c" Ta "d" Ta "e"
+.El
+.\" Mixed tab and Ta
+.Bl -column a b c d
+.It a	b	c	d
+.It a	b	c Ta d
+.It a	b Ta c	d
+.It a	b Ta c Ta d
+.It a Ta b	c	d
+.It a Ta b	c Ta d
+.It a Ta b Ta c	d
+.It a Ta b Ta c Ta d
+.El
+.\" Macros before and after tabs
+.Bl -column "aa" "OpenBSD OpenBSD OpenBSD"
+.It aa Ta Ox Ox Ox Ta tab-tab
+.It aa Ta Ox Ox Ox	tab-ta
+.It aa	Ox Ox Ox Ta ta-tab
+.It aa	Ox Ox Ox	ta-ta
+.It aa	Ox Ox Ox 	ta-bl/ta
+.It aa	 Ox Ox Ox	ta/bl-ta
+.It aa	  Ox Ox Ox 	ta/bl-bl/ta
+.It aa Ta bb Ta
+ta at eol
+.It aa	bb	
+tab at eol
+.El
+.\" Interrupted column list
+.Bl -column "aa" -width 6n -compact "bb" "cc"
+.It aa Ta bb Ta cc Ta dd
+.El