Make one purl right and make one purl left (m1pr & m1pl) #knitting

These are very easy, if you already know the make one right and make one left increases, the only difference being that you purl instead of knit.

As with the make one right, the purl increase can also be a bit tricky. I pull the stitch to create some slack and press with my left thumb to be able to insert the needle into the stitch.