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6.8 Predicate Slots

Suffix and group objects share some predicate slots that control whether a group or suffix should be available depending on some state. Only one of these slots can be used at the same time. It is undefined what happens if you use more than one.

One more slot is shared between group and suffix classes, level. Like the slots documented above it is a predicate, but it is used for a different purpose. The value has to be an integer between 1 and 7. level controls whether it should be available depending on whether the user wants that or not. See Enabling and Disabling Suffixes.