I'm assuming that you're working this back and forth, and that the odd numbered rows are the right side.
Since your repeats are 10 stitches, I'm not sure where you get the 52 stitches, unless you knit the first and last for seaming. If that's the case, work the cable on the first 4 stitches, k2, p4.
A 4-stitch cable uses 4 stitches, and any further directions, in this case the k2, would be in addition to the cable.
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IngridKH on Ravelry