FIG. 1 is a perspective view of the set of building blocks of the design;
FIG. 2 is an enlarged-scale perspective view of a first block of the set of building blocks in accordance with the design;
FIG. 3 is an enlarged-scale top plan view of the first block, the bottom elevational view being identical;
FIG. 4 is an enlarged-scale right side elevational view of the first block, the left side elevational view being a mirror image thereof;
FIG. 5 is an enlarged-scale front elevational view of the first block;
FIG. 6 is an enlarged-scale rear elevational view of the first block;
FIG. 7 is a perspective view of a second block of the set of building blocks in accordance with the design;
FIG. 8 is an enlarged-scale top plan view of the second block;
FIG. 9 is an enlarged-scale bottom plan view of the second block;
FIG. 10 is an enlarged-scale right side elevational view of the second block;
FIG. 11 is an enlarged-scale left side elevational view of the second block;
FIG. 12 is an enlarged-scale front elevational view of the second block;
FIG. 13 is an enlarged-scale rear elevational view of the second block;
FIG. 14 is an enlarged-scale perspective view of a third block of the set of building blocks in accordance with the design;
FIG. 15 is a right side elevational view of the third block, the left side elevational view being identical;
FIG. 16 is a reduced-scale top plan view of the third block;
FIG. 17 is a reduced-scale bottom plan view of the third block;
FIG. 18 is an enlarged-scale front elevational view of the third block, the rear elevational view being identical;
FIG. 19 is an enlarged-scale perspective view of a fourth block of the set of building blocks in accordance with the design;
FIG. 20 is an enlarged-scale right side elevational view of the fourth block, the left side elevational view being a mirror image thereof;
FIG. 21 is an enlarged-scale top plan view of the fourth block;
FIG. 22 is an enlarged-scale bottom plan view of the fourth block;
FIG. 23 is an enlarged-scale front elevational view of the fourth block, the rear elevational view being identical;
FIG. 24 is an enlarged-scale perspective view of a fifth block of the set of building blocks in accordance with the design;
FIG. 25 is an enlarged-scale right side elevational view of the fifth block, the left side elevational view being a mirror image thereof;
FIG. 26 is an enlarged-scale top plan view of the fifth block;
FIG. 27 is an enlarged-scale bottom plan view of the fifth block;
FIG. 28 is an enlarged-scale front elevational view of the fifth block, the rear elevational view being identical;
FIG. 29 is an enlarged-scale perspective view of a sixth block of the set of building blocks in accordance with the design;
FIG. 30 is an enlarged-scale top plan view of the sixth block, the bottom elevational view being identical;
FIG. 31 is an enlarged-scale right side elevational view of the sixth block, the left side elevational view being a mirror image thereof; and,
FIG. 32 is an enlarged-scale front elevational view of the sixth block, the rear elevational view being identical.
FIGS. 2-32 are shown separately for ease and clarity of illustration. The portions of the drawings shown in broken lines form no part of the claimed design.