MAME seeks from more concrete to more general. First, it looks for a specific artwork for the game and if it can't find it, it goes to a more general level (for example, a generic artwork for all NeoGeo games, or Nintendo playchoice, etc). If it does not find anything, it goes to another more general level and at the end, if it does not find anything, it uses the generic that MAME has internally.
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