FIG. 1 is a perspective view of a keyboard showing the claimed design;
FIG. 2 is another perspective view of FIG. 1;
FIG. 3 is a front elevational view of FIG. 1;
FIG. 4 is a rear elevational view of FIG. 1;
FIG. 5 is a left side elevational view of FIG. 1;
FIG. 6 is a right side elevational view of FIG. 1;
FIG. 7 is a top plan view of FIG. 1;
FIG. 8 is a bottom plan view of FIG. 1; and,
FIG. 9 is a partial enlarged view according to a “circle area A” of FIG. 1.
The broken lines in the figures represent portions of the article which form no part of the claimed design.