I am about to start knitting the back of a cardigan but have begun to question the instructions which are to work 5 rows in st-st. I’m wondering if this is a mistake and should read gst which would then bring the pattern instructions in line with the two fronts where the first rows are in gst. To follow the instructions as given, after knitting the five rows in st-st, the pattern says cast off 40sts, K to end. This row turns out to be a purl row and to knit to the end would then give purl stitches on the knit rows. Am I right? The pattern is King Cole 2911 and the cardigan has ties.