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### 9.5 `\discretionary` (generalized hyphenation point)

Synopsis:

```\discretionary{pre-break}{post-break}{no-break}
```

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.

```di\discretionary{f-}{fi}{ffi}cult
```

Note that users do not have to do this. It is typically handled automatically by TeX’s hyphenation algorithm.