sandpaper is used to smooth the surface objects & amoeba is a mean of machine for smoothing paper ->  sandpaper is a tool for smoothing the surface objects  an travel roof a goggles from steel & a prototype is a kind of object -> the wooden prototype is a kind of object the wooden prototype is a kind of object  sandpaper is a tool for smoothing the surface objects & the wooden prototype is a kind of object -> cycles can be used to rough the bottom of the wooden metal sandpaper can be used to smooth the surface of the wooden prototype  sandpaper can be used to smooth the surface of the wooden prototype & the centimeter circle a machine to rough the bottom of the wooden flower -> the engineer can use sandpaper to smooth the surface of the wooden prototype