Help with pattern decrease

What does it mean to dec 1 stitch at each end on every foll alt row until 30 sts. Dec 2 st at each end on every foll 4th row until 26 sts.

decrease once at each end, every other row. continue in this fashion until you have 30 stitches on the needle.

on every 4th row, decrease 2 stitches at each end.