The ornamental design for a constructionsetelement, as shown and described.
FIG. 1 is a top rear perspective view of a construction set element showing the new design;
FIG. 2 is a front side elevational view of the construction set element of FIG. 1;
FIG. 3 is a rear side elevational view of the construction set element of FIG. 1;
FIG. 4 is a right side elevational view of the construction set element of FIG. 1;
FIG. 5 is a left side elevational view of the construction set element of FIG. 1;
FIG. 6 is a top plan view of the construction set element of FIG. 1; and,
FIG. 7 is a bottom plan view of the construction set element of FIG. 1.
The broken lines and unshaded areas form no part of the claimed design. In addition, the construction set element depicted in the drawings is the left side embodiment, the right side embodiment being a mirror image thereof. The claimed design covers both embodiments.