Shown with a cast-on count of 25 stitches.  

• Row 1 (RS): P8, k4, purl to last 12 sts, k4, p8.
• Row 2: K8, p4, knit to last 12 sts, p4, k8.
• Row 3: P7, sl1-k2tog-psso, [yo, k1] twice, p1, [k1, yo] twice, sl1-k2tog-psso, p7.
• Row 4: K7, p5, knit to last 12 sts, p5, k7.
• Row 5: P5, sl1-k2tog-psso, [k1, yo] twice, k2, p1, k2, [yo, k1] twice, sl1-k2tog-psso, p5.
• Row 6: K5, p7, knit to last 12 sts, p7, k5.
• Row 7: P3, sl1-k2tog-psso, k2, yo, k1, yo, k3, p1, k3, yo, k1, yo, k2, sl1-k2tog-psso, p3.
• Row 8: K3, p9, knit to last 12 sts, p9, k3.
• Row 9: P1, sl1-k2tog-psso, k3, yo, k1, yo, k4, p1, k4, yo, k1, yo, k3, sl1-k2tog-psso, p1.
• Row 10: [K1, p11] twice, k1.
• Row 11: [P1, yo, ssk, k7, k2tog, yo] twice, p1.
• Row 12: K1, p10, k3, p10, k1.
• Row 13: P1, k1, yo, ssk, k5, k2tog, yo, p3, yo, ssk, k5, k2tog, yo, k1, p1.
• Row 14: K1, p9, k5, p9, k1.
• Row 15: P1, k2, yo, ssk, k3, k2tog, yo, p5, yo, ssk, k3, k2tog, yo, k2, p1.
• Row 16: K1, p8, k7, p8, k1.
• Row 17: P1, k3, yo, ssk, k1, k2tog, yo, p7, yo, ssk, k1, k2tog, yo, k3, p1.
• Row 18: K1, p7, k9, p7, k1.
• Row 19: P1, k4, yo, sl1-k2tog-psso, yo, p9, yo, sl1-k2tog-psso, yo, k4, p1.
• Row 20: Knit.