The pattern says it's a 17+2 repeat -- so you can cast on any multiple of 17 stitches plus two, and simply repeat the chart.
ETA: I started to knit this and realized that when repeating, you need to make one modification -- you know how the pattern starts and ends with 2 knit stitches (on the RS)...between repeats, omit two of those -- i.e. work the pattern to the end, then don't knit the first two stitches when you repeat. Does that make sense??
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