Cast off on each side on alternative rows. What does this mean? Do I cast off on the next knit row and then at the beginning of the purl row?
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Yes, that’s right. Cast off at the beginning of the next 2 rows. So if the next row is a knit row, cast off the given number of sts, work to the end of the row, turn and cast off the correct number of sts on the purl row, then finish the row.