FIGURE 3: HARDWORK

Drawings 3A and 3B = merely indicates that the long round rod and the short
round rod represented in this visual as a pencil and a cover really fits to
one another. As you go any further, it disproves that 3A and 3B won't fit to
drawings 3C and 3D.

Drawings 3C and 3D = also disproves the fact that these two four-sided rods
won't either fit to the visuals above, represented by drawings 3A and 3B.