Assertion: undisputed champion | /r/HasProperty | mandatory defense
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Source sentences:
text: Around 2004, the World Boxing Association recognized three different types: the unified champion (two-titles holder in the weight division or category, obliged to defend the title against WBA's No. 1 contender in 18 months periodically), the undisputed champion (three-titles holder, mandatory defense against WBA's challenger in 21 months regularly) and the super champion (four-titles holder, WBA's mandatory defense in 24 months periodically).