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+.\" THIS WILL FAIL ON OLD GROFF!
+.\" IT DOESN'T PROCESS EMPTY `AR' MACROS CORRECTLY.
+.Dd May 16, 2010
+.Dt FOO 1
+.Os
+.Sh NAME
+.Nm foo
+.Nd bar
+.Sh DESCRIPTION
+.Ar . a
+.Pp
+.Ar ;
+.Pp
+.Ar expr1 Ar : expr2
+.Pp
+.Ar expr1 Ar . ; expr2 ( expr3 )
+.Ar expr1 Ar . ; ) ( expr3 )