var -> let
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@@ -104,7 +104,7 @@ class WorldEnvironment extends Environment{
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clearWalls() {
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for(var wall of this.walls){
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var wcell = this.grid_map.cellAt(wall.col, wall.row);
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let wcell = this.grid_map.cellAt(wall.col, wall.row);
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if (wcell && wcell.state == CellStates.wall)
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this.changeCell(wall.col, wall.row, CellStates.empty, null);
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}
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