Design detail of the cube, in its basis, in which the three mutually perpendicular faces disposed on one cylindrical protrusion, and on the opposite them faces - to deepen the square-sectional sides of which are equal to the diameter of the protrusion, and on all edges of the cube are recesses, in cross-section equal to a quarter of a circle, which gives, when combined in pairs four similar pieces, round hole in the center of their combination.
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