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The ornamental design for an “alphabet teaching device,” as shown and described.
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FIG. 1 is a front perspective view of an “alphabet teaching device” showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a right side elevational view thereof, the left side being the mirror image thereof; and,
FIG. 6 is a perspective view showing the device in its folded condition for carrying.
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