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gravity gravity cold cold light light atom atom magnet magnet amplitude amplitude quark quark adhesiveness adhesiveness balance balance pulley pulley shape shape center of mass center of mass chemical chemical compass compass crystal crystal crystal crystal stream stream density density voltage voltage electricity electricity transistor transistor electronics electronics pressure pressure gas gas impact impact space space laser laser level level liquid liquid microscope microscope mirror mirror movement movement wave wave physics physics optics optics plasma plasma radiation radiation reflection reflection resistor resistor telescope telescope sound sound spectrum spectrum value value wavelength wavelength distance distance measurement measurement smoke smoke steam steam thermometer thermometer battery battery |
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