I am attemping to knit a swearter for the first time and I have run into part of the pattern I don't understand. The instructions are... (WS). Purl, dec 14 sts evenly across. 90 sts. I understand about the wrong side and decrease 14 stiches evenly across, but I don't understand what it means by 90 stiches. Can someone help me, please. Lost in NC.