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I claim the ornamental design for a construction block, as shown.
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FIG. 1 is a front perspective view of a construction block according to one preferred embodiment of the present design;
FIG. 2 is a rear perspective view of the construction block;
FIG. 3 is a top view of the construction block;
FIG. 4 is a bottom view of the construction block;
FIG. 5 is a right side view of the construction block;
FIG. 6 is a left side view of the construction block;
FIG. 7 is a front view of the construction block; and,
FIG. 8 is a rear view of the construction block.
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