Mystery stitch (Ravelry thread 3971282)

As discussed in Help reading a chart (unclear symbols)

Shown with a cast-on count of 33 stitches.   Getting chart...

  • Row 1 (RS): P3, *k1, p1, k1, p1, k1, k2tog, [p1, k1] twice, yo, k1, p3, repeat from *.
  • Row 2: K3, *p2, yo, [p1, k1] twice, p2tog, k1, p1, k1, p1, k3, repeat from *.
  • Row 3: P3, *k1, p1, k1, k2tog, [p1, k1] twice, yo, p1, k2, p3, repeat from *.
  • Row 4: K3, *p2, k1, p1, yo, [p1, k1] twice, p2tog, k1, p1, k3, repeat from *.
  • Row 5: P3, *k1, k2tog, [p1, k1] twice, yo, p1, k1, p1, k2, p3, repeat from *.
  • Row 6: K3, *p2, k1, p1, k1, p1, yo, [p1, k1] twice, p2tog, k3, repeat from *.