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The ornamental design for the construction block, as shown and described.
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FIG. 1 is a front perspective view;
FIG. 2 is a front elevational view;
FIG. 3 is a back view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view of my invention.
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