How do you do a purl slip slip stitch?

Do you slip Knitwise Purlwise?

To slip a stitch, insert the RH needle purlwise (as if you were going to purl) into the first stitch on the LH needle and slip it off the LH needle onto the RH needle. Unless your instructions specifically tell you to slip a stitch knitwise, always slip a stitch as if you were going to purl it.

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