The ornamental design for notebook, as shown and described.
FIG. 1 is a top right perspective view of a notebook showing my new design;
FIG. 2 is a front elevation view thereof, the rear being a mirror image thereof;
FIG. 3 is a right side elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a top plan view thereof, the bottom being a mirror image thereof; and,
FIG. 6 is a top rear perspective view thereof with the notebook in an open position.
The dashed lines shown in FIGS. 1,2, 4 and 6 are intended to be stitching. The dashed-dot-dashed lines shown in FIGS. 3, 5 and 6 are broken lines that depict unclaimed elements that form no part of the claimed design