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==== Oppositional categories ====
 
==== Oppositional categories ====
 
This a a pair of categories, where one is the opposite of the other. For instance the category ''sweetened beverages'' is opposite to the the ''unsweetened beverages''. Both can not be true at the same time.
 
This a a pair of categories, where one is the opposite of the other. For instance the category ''sweetened beverages'' is opposite to the the ''unsweetened beverages''. Both can not be true at the same time.
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==== Mixed categories ====
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Unfortunately we need to mix all these approaches depending on the various usage needs. Within one category there might be multiple (competing) approaches. Each approach should however cover all products. These approaches might be inherited as well.
    
== Examples ==
 
== Examples ==
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