You can insert a natural class that is defined by its phonemes or by phonological features.
In the Navigation Pane, click Grammar, and then click Natural Classes.
To insert a natural class defined by its phonemes, do one of the following:
On the Insert toolbar, click .
On the Insert menu, click Natural Class (phonemes).
Press the shortcut keys Ctrl+I.
A natural class is added.
To insert a natural class defined by phonological features, do one of the following:
On the Insert toolbar, click .
On the Insert menu, click Natural Class (features).
A natural class is added.
Enter a name, description, and an abbreviation (the abbreviation , such as V or C is used to represent the natural classes in environments).
Do one of the following, depending on which field appears in the pane:
Edit a natural class has important information.