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peterhoh: Cup and cardboard tower
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peterhoh: DSCN2766
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peterhoh: DSCN2768
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peterhoh: Truss bridge activity prototype
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peterhoh: Truss Bridge Prototype -- angled view
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peterhoh: Dixie Cup pyramid
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peterhoh: DSCI3668.JPG
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peterhoh: Keva Plank structure
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peterhoh: bridge