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# Use Youtube player (with Youtube AD) #<<<>>> # Use our player (Downlaod, Unblock & No Youtube AD) 再生できないときはここをクリック click hrer if failed to load 如无法播放请点击这里#

INFO:
Polyhierarchy is used to place a single item in more than one IA category. This can support users with different mental models but should be used judiciously.
Polyhierarchy in Information Architecture (Video)