Shown with a cast-on count of 3 stitches.  

• Rows 1 and 3 (RS): *K1, [SB] 5 times, repeat from * to last st, k1.
• Rows 2 and 4: *P1, [SB] 5 times, repeat from * to last st, p1.
• Row 5: *K1, [SB] 4 times, repeat from * to last st, k1.
• Row 6: *P1, [SB] 4 times, repeat from * to last st, p1.
• Row 7: *K1, [SB] 3 times, repeat from * to last st, k1.
• Row 8: *P1, [SB] 3 times, repeat from * to last st, p1.
• Row 9: *K1, [SB] twice, repeat from * to last st, k1.
• Row 10: *P1, [SB] twice, repeat from * to last st, p1.
• Row 11: *K1, SB, repeat from * to last st, k1.
• Row 12: *P1, SB, repeat from * to last st, p1.
• Repeat rows 11-12.