I claim the ornamental design for a knife with three parallel blades, as shown and described.
FIG. 1 is a top front perspective view showing the knife with three parallel blades of an embodiment of the present invention, with the three blades being parallel, of equal length, and identical or substantially identical to each other;
FIG. 2 is a bottom rear perspective view of the knife with three parallel blades of FIG. 1; and,
FIG. 3 is a top view of the knife with three parallel blades of FIGS. 1 and 2.
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