YO DEC (RS)
(Yarn Over Decrease Right-Slant)
A right-slanting decrease to match the Yarn Over increase below it.
k2tog, yarn over, k2tog
k2tog, yarn over, k2tog
YO DEC (LS)
(Yarn Over Decrease Left-Slant)
Here is a decrease to match the Yarn Over increase below it. YO is included to create the hole in the knitting. But since yarn over is an increase, it is banked by two left slanting decreases to equal 1 total decreased stitch.