Blues instructions

Well, I'm working along on Blues and mostly it's going fine. I solved my yarn problem from the previous post and to my great surprise, I have a second yarn which fits nicely into the pattern. However, the line which says 'decrease alternately on the 7th & 8th stripe' leaves me confused. So I'm decreasing every 7th stripe by 2 stitches. The rest doesn't make sense. Does anybody have other suggestions for me?