Knitting Instructions Purl
I don't understand when it says this:
Row 7 and foll 2 alt rows: purl
Your instructions are telling you to purl all stitches on the 7th, 9th and 11th rows.
If the instructions were written in long hand, they would read as follows:
Purl all stitches on the 7th row. Complete row 8 as per previous instructions, purl all stitches on the 9th row. Repeat the last 2 rows once more.