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Each set must be in an independent file (we will see later that this is not strictly necessary) with a particular name.
Continuing with our example, we can say that the two 1941 sets must be named 1941(World) and 1941(Japan).
MAME can solve this problem by erasing the duplicated ROMs from each of the clone sets and storing them only in the main set There is one final method: Not Split.
If there was an independent file for each set, for MAME version 0.59 there would be a total of 3290 files (the number of sets for v0.59).
Without them, this guide wouldnt have a reason to exist.