ConstraintStrength 
    The strength of a constraint, expressed as a symbolic constant.
The strength of a class@Constraint can be expressed with any positive integer; the values of this enumeration can be used for readability.
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                  Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
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                  Returns an array containing the constants of this enum type, in the order they're declared.