Slip Slip Purl (SSP)
Slip slip purl will mostly happen on the purl side of your work. It decreases 1 stitch and looks like it’s leaning to the left.
Step 1: Slip the next 2 stitches knitwise to the right-hand (RH) needle.
Step 2: Move these two stitches back to the left-hand needle purlwise.
Step 3: Insert the RH needle into these two stitches through their back loops.
Step 4: Purl 2 together.