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build is a local counter variable for the loop; it sequentially takes values from TOWN_BUILDING_DWELLING_1 (its numerical value is 7) to TOWN_BUILDING_DWELLING_7 (13), and the line SetTownBuildingLimitLevel('houseInferno', build, 0) is executed for each of these values. i is a similar counter, but with values from 1 to 2, so that the upgrade of each building is performed twice (construction + upgrade).
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