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I need to build a bridge for school. My requirments are as follows. It needs to be made of wood only but i can use glue. It must span 40 inches but no more than 46. it needs to be a min of 6 inches wide but no more than 10. we are allowed to use wood stock of 3/4 by 1/4 inches. and it can only weigh about 2.5 lbs.