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The ornamental design for an ergonomic keyboard, as shown. |
FIG. 1 is a top view of an ergonomic keyboard;
FIG. 2 is a bottom view thereof;
FIG. 3 is front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a right end view thereof;
FIG. 6 is left end view thereof; and,
FIG. 7 is a perspective view thereof.
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