how do solve Pp, Ppk when the standard deviation is zero?

I would like to know how to report the Pp and Ppk when the standard deviation is 0? The formula for is Pp=(USL-LSL)/(6 x s). The formulas for the Ppk are (USL-Xbar)/(3 x s) and (Xbar-LSL)/(3 x s).
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