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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 a suffix or a group should be available depending on user preference. See Enabling and Disabling Suffixes.