Beautiful pattern with knitting needles

Pattern rapport 4 stitches and 6 rows.
For flat knitting, cast on a number of stitches multiple of 4 + 3 stitches for symmetry + 2 edge stitches.
Pattern description for flat knitting:
Row 1: edge stitch, *3 purl stitches, 1 knit stitch*, 3 purl stitches, edge stitch.
Row 2: edge stitch, 3 knit stitches,* 1 purl stitch, 3 knit stitches,*, edge stitch.
Row 3: edge stitch, *3 purl stitches, 1 knit stitch*, 3 purl stitches, edge stitch.
Row 4: edge stitch, 3 knit stitches,*1 purl stitch, 3 knit stitches,*, edge stitch.
Row 5: edge stitch, *3 purl stitches, from the knit stitches of the first 4 rows, form 9 stitches*, 3 purl stitches, edge stitch.
Row 6: edge stitch, 3 knit stitches,* 9 stitches knit 1 purl stitch, 3 knit stitches*, edge stitch.
Pattern description for circular knitting.
Cast on a number of stitches multiple of 4.
Row 1:*3 purl stitches, 1 knit stitch*
Row 2:*3 purl stitches, 1 knit stitch*
Row 3:*3 purl stitches, 1 knit stitch*
Row 4:*3 purl stitches, 1 knit stitch*
Row 5:*3 purl stitches, from the knit stitches of the first 4 rows, form 9 stitches*
Row 6:*3 purl stitches,* 9 stitches knit 1 knit stitch*