| 
 | The ornamental design for pen, as shown and described. | |||||||||||||||||
FIG. 1 is a perspective view of a pen showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and
FIG. 8 is a perspective view of a modified form of the pen.
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