The ornamental design for a sheet of writingpaper, as shown and described.
FIG. 1 is a front view of a sheet of writing paper showing my design; and,
FIG. 2 is a rear view thereof.
The outside dashed line shown in FIG. 1 and FIG. 2 define the bounds of the sheet of paper and form no part thereof. Three dashed circles on the side of sheet shown depict the holes and form no part thereof.
The ruled paper is thin and flat sheet therefore does not have appreciable thickness.
My design is characterized by a line approximately in the middle of page dividing the writing space into two sections.