Slip, Slip, Purl

Otherwise known as "SSP"

A way of decreasing on a purl row that mirrors K2tog

Slip one stitch knitwise, (to do this – place your right hand needle into the stitch as if you’re going to knit it, then before you knit it slip it off the left hand needle onto the right hand needle)
Slip the next stitch knitwise (so both stitches are unknit and on the right hand needle)
Pass both stitches back onto the left hand needle
With your yarn at the front purl into the back loops of both stitches (it feels a bit fiddly but that’s how you know you’re doing it right)

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