u/No_Choice_2031

Sorry if it’s a stupid question but the gauge swatch for the Mixed Rib cami by Florence miller says 30x38 in mixed rib stitch. But doesn’t given instructions of the 30 stitches. I was going to just do row 1 and 2 of the pattern repeat but that’s only 20 stitches so wondering if I could just do 10 extra knits and purls or if there is a specific pattern I’m meant to be following for the gauge swatch?

Thanks!