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Preference Rule
The preference rule applies a constraint when certain conditions are true, but allows the constrainte engine to override the constraint if the user input violates the constraint conditions. For example, use the preference rule to specify that, when laptop display is 2K, the display size should be 15 inch or larger, but allow the configuration to continue without failing if the user selects a smaller display size, and deliver an error message indicating that display size should be 15 inch or larger.

