The ornamental design for a coordinated set of furniturebacks, as shown and described.
FIG. 1 is a perspective view of the coordinated set of furniture backs.
FIG. 2 is a front view of the coordinated set of furniture backs.
FIG. 3 is a back view of the coordinated set of furniture backs.
FIG. 4 is a top view of the coordinated set of furniture backs; and,
FIG. 5 is a side view of the coordinated set of furniture backs.
The characteristic feature of the design resides in the coordinated set of furniture backs forming the profile of a wave extending across the set of furniture backs.
The broken lines shown in the drawings illustrate portions of the article that form no part of the claimed design.