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Two or More `First' Lines
=========================
To create two or more `first' or header lines for a definition,
follow the first `@deffn' line by a line beginning with `@deffnx'. The
`@deffnx' command works exactly like `@deffn' except that it does not
generate extra vertical white space between it and the preceding line.
For example,
@deffn {Interactive Command} isearch-forward
@deffnx {Interactive Command} isearch-backward
These two search commands are similar except ...
@end deffn
produces
- Interactive Command: isearch-forward
- Interactive Command: isearch-backward
These two search commands are similar except ...
Each of the other definition commands has an `x' form: `@defunx',
`@defvrx', `@deftypefunx', etc.
The `x' forms work just like `@itemx'; see itemx