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The ornamental design for a building block, as shown and described. |
FIG. 1 is a front perspective view of one embodiment of the building block;
FIG. 2 is a left side elevational view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a front perspective view of another embodiment of the building block;
FIG. 5 is a rear perspective view of the building block of FIG. 4;
FIG. 6 is a left side elevational view of the building block of FIG. 4;
FIG. 7 is a top plan view of the building block of FIG. 4;
FIG. 8 is a front perspective view of another embodiment of the building block;
FIG. 9 is a left side elevational view of the building block of FIG. 8;
FIG. 10 is a top plan view of the building block of FIG. 8;
FIG. 11 is a front perspctive view of another embodiment of the building block;
FIG. 12 is a left side elevational view of the building block of FIG. 11; and
FIG. 13 is a top plan view of the building block of FIG. 11.
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