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The ornamental design for a building construction block, as shown and described. |
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FIG. 1 is a top view of the construction building block of my new design;
FIG. 2 is a right side elevation view of the building block;
FIG. 3 is a front end view of the building block;
FIG. 4 is a rear end view of the building block;
FIG. 5 is a bottom view of the building block; and
FIG. 6 is a left side elevation view of the building block.
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