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To rotate a piece, simply select it and press and hold the right mouse button.To ensure that you have no gaps between the objects, zoom in and out and also rotate your objects to check for gaps.Go ahead and make your third wall piece NorRmSmCorIn01. This will allow you to replace the object with another. Should you want a different object than the first (for example a Corner piece), select the duplicate and press Control F. This method is less accurate than the first and I would recommend using only the first method for now.
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