Topic on Talk:Gambling Game
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This also sounds arbitrary to the point of inanity.
If a clear relationship can be observed between two tropes, a trope and a type of work, etc., then it should be noted as such, and this should not require any prescriptivism to some set of indexes - after all, it is those observations that serve as the basis for the indexes, and not the other way around, as that would make no sense.