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Basically, we made our bridge to dominate. We layered perpendicular sticks in two layers to give the bottom support. We created the sides with multiple points that could be glued to the double-layered base. This gave more support to the middle. It broke because the sidings became warped and crumpled. It would have been stronger with supports connecting the two sidings, and an all-around better bridge design. Our original would have been much more durable, but most likely over-weight.