. .de IX .ie '\\n(.z'' .tm IX: \\$1 \\$2 \\$3 \\$4 \\$5 \\$6 \\$7 \\$8 \\$9 {\\n(PN} .el \\!.IX \\$1 \\$2 \\$3 \\$4 \\$5 \\$6 \\$7 \\$8 \\$9 {\\n(PN} .. This is a sample file to test the \fImakeindex\fP(1L) program, and see .IX {indexing!programs!C language} .IX {makeindex@\fImakeindex\fP(1L)} .bp .rs .IX {Knuth} .IX {typesetting!computer-aided} how well if functions in the \fItroff\fP(1) environment.