Specifies how many tiles this tile set used to have, indicating that the number of tiles has changed. This flag was presumably used by the games' internal map editor. IsoMapPack5 section in map uses tile numbers/index counted from the first tile set to the last. When any change in the number of tiles is made in an intermediate tile set, all the tile numbers that comes after the change gets wrong reference. To temporarily fix this, LastTilesInSet is used. After the affected maps are corrected to reference the correct tiles based on tile numbers, this temporary fix is removed from the terrain control INI files.
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