The original ribbon (Ravelry Fingerslip mittens) adapted for 2 colors. Purl represents color A and contains the increases. The decrease has color B as the facing stitch and A s the back stitch. The color B 5 stitch "ribbon" decreases to 1 stitch, "turns" and increases back to 5 stitches, moving across. This is the left turn version. Mirror it for the right turn.