Builder
Collects the definition of one rating question. Levels are added from lowest to highest. Each call to build returns a new question, and later changes to the builder do not affect questions it already built. A builder is not safe for use from several threads at once.
Functions
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Sets the instructions, replacing any set earlier.
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Returns a new question with the current definition.
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Adds a level above those already added, using the label as both its id and description.
Adds a level above those already added.