I would think it means this. Say the first row that you increase on is called row 1. So you would increase one stitch each side on row 1, row 3, row 7, row 9, row 13, and row 15. So you are alternating between every 2 rows and every 4 rows, a total of 6 increase rows which should bring you to 80 stitches.
That's how I would interpret it anyways, maybe someone else has another opinion.
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