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| OR 제약 조건 (An indicator of a situation in which any instance of a class can participate in only one association at one time. The constraint is shown as a dashed line connecting two or more associations, which must have a class in common) | |||
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| OR 제약 조건 (An indicator of a situation in which any instance of a class can participate in only one association at one time. The constraint is shown as a dashed line connecting two or more associations, which must have a class in common) | |||
