The ornamental design for a domino embedded in a cup, as shown and described.
FIG. 1 is a front perspective view of a domino embedded in a cup, showing my new design;
FIG. 2 is a front elevation view of the present design;
FIG. 3 is a rear elevation view of the present design;
FIG. 4 is a left side elevation view of the present design;
FIG. 5 is a right side elevation view of the present design;
FIG. 6 is a top plan view of the present design; and,
FIG. 7 is a bottom plan view of the present design.
The broken lines in the drawings depict environmental subject matter only and form no part of the claimed design. The dash-dotted lines represent the bounds of the claim and form no part of the claimed design.