Work 5 [9, 9, 9, 5, 9, 9, 9] rows This probably refers to different sizes so pick the number for your size.
dec 1 st at each end of next So decrease at each end of the next row (that's 2 sts decreased), then
and every foll 4th row. For every 4th row you would work 3rows with no decrease and then decrease on the 4th. Do this until the pattern tells you what to do next.