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The ornamental design for a ruler, as shown and described. |
FIG. 1 is a front elevational view of a ruler showing my new design;
FIG. 2 is a left side edge view thereof;
FIG. 3 is a right side edge view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a front elevational view of a second embodiment showing my new design of FIGS. 1-4; and,
FIG. 6 is a rear elevational view thereof.
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