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K'nex 79319 K'NEX Stem Explorations Levers and Pulleys Building Set for Ages 8 and Up Construction Educational Toy, 139 Pieces : Amazon.es: Juguetes y juegos
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K'NEX Education - Intro to Simple Machines: Levers and Pulleys Set – 178 Pieces – For Grades 3-5 – Construction Education Toy
K'NEX® Education Intro to Simple Machines: Levers and Pulleys Set | Force & Motion | Physical Science | Science | Education Supplies | Nasco
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