Set of building blocks

FIG. 1 is a front, right and top perspective view of a set of building blocks, showing our new design;

FIG. 2 is a rear, left and bottom perspective view thereof;

FIG. 3 is a rear, right and top perspective view of another state therof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a right side view thereof;

FIG. 8 is a top plan view thereof; and,

FIG. 9 is a bottom plan view thereof.

The broken lines shown in the drawings illustrate portions of the set of building blocks that form no part of the claimed design.