Handle word changes around hyphens. This command is not often used in LaTeX documents.
If a line break occurs at the point where
\discretionary appears then TeX puts pre-break at the end of the current line and puts post-break at the start of the next line. If there is no line break here then TeX puts no-break
In ‘difficult’ the three letters
ffi form a ligature. But TeX can nonetheless break between the two f’s with this.
Note that users do not have to do this. It is typically handled automatically by TeX’s hyphenation algorithm.
© 2007–2018 Karl Berry
Public Domain Software