The ornamental design for a string of decorativelights, as shown and described.
FIG. 1 is a perspective view of a first embodiment of a string of
decorative lights showing replicas of Chevrolet , automobile, a Pontiac
automobile, and a Ford automobile on the light string. FIGS. 2 through 7
are respectively side, perspective, front, rear, top, and bottom view s of
the Chevrolet automobile hung from the light string, the Ford and Pontiac
being omitted for convenience of illustration; FIG. 8 is a perspective
view of a second embodiment of a string of Chevrolet race cars only. FIGS.
9 through 14 are respectively side, perspective, front, rear, top, and
bottom views of the Ford automobile hung from the light string, the
Chevrolet and Pontiac being omitted for convenience of illustration FIG.
15 is a side perspective view of a third embodiment of the design
consisting of a string of Ford race cars; FIGS. 16 through 21 are
respectively side, perspective, front, rear, top, and bottom views of the
Pontiac automobile hung from the light string, the Chevrolet and Ford
being omitted for convenience of illustration; and FIG. 22 is a fourth
embodiment of the design consisting of a string of Pontiac race cars. The
light string is understood to have indefinite length. The broken lines are
shown for illustrative purposes and are not part of the claimed design.