We claim the ornamental design for blank for a cigarette packet, as shown and described.
FIG. 1 is a top plan view of a first embodiment of a blank for a cigarette packet showing our new design; and,
FIG. 2 is a top plan view of a second embodiment thereof.
The bottom plan and edge views of all embodiments are disclaimed and, therefore, not shown. In all of the Figs., the evenly dashed lines are visible depressions that are part of the claimed design. The solid lines generally vertically in the left third of FIG. 1 and the right third of FIG. 2 are pre-cut lines. The three shaded boxes about the top of FIG. 1 are shaded lines that are disclaimed in other embodiments.