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					@ -460,7 +460,7 @@ static bool is_valid_building_site(building_site &site, bool orthogonal_check, b
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					                return false;
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					                return false;
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					            if (material == tiletype_material::CONSTRUCTION)
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					            if (material == tiletype_material::CONSTRUCTION)
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					            {		
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					            {
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					                // Check this is not a  'constructed floor over X':
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					                // Check this is not a  'constructed floor over X':
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					                // those have something else than open space as *basic* tile types: stonefloor, smoothstonefloor, ...
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					                // those have something else than open space as *basic* tile types: stonefloor, smoothstonefloor, ...
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					                MapExtras::MapCache mc;
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					                MapExtras::MapCache mc;
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