A 1G1R set solves this problem by carefully curating a collection that contains only definitive version of each game for a given system. The goal is to eliminate redundancy and duplicates while providing a complete library of playable software. When duplicates are present, the set uses a predetermined hierarchy (e.g., preferring USA versions over European or Japanese ones) to decide which single file remains.
If you are searching for the "full" version of such a collection, be aware of the following:
Covering 8-bit, 16-bit, and even some 32-bit/64-bit systems. Key Benefits of the Hearto Collection