Rows 1, 5, 9, and 13 (WS): *P1, brSl, repeat from *.
Rows 2, 6, 10, and 14 (WS): BrSl, k1, *[brSl, k1] 4 times, brSl, (k1, yo, k1) in next st, repeat from * to last 2 sts, brSl, k1 (multiple of 12 sts, plus 4).
Row 3: BrSl, k1, *brSl, k1, brSl, sl1-k2tog-psso, [brSl, k1] 3 times, repeat from * to last 2 sts, brSl, k1 (multiple of 10 sts, plus 4).
Rows 4, 8, 12, and 16 (RS): *P1, brSl, repeat from *.
Row 7: BrSl, k1, *[brSl, k1] twice, brSl, sl1-k2tog-psso, [brSl, k1] twice, repeat from * to last 2 sts, brSl, k1 (multiple of 10 sts, plus 4).
Row 11: BrSl, k1, *[brSl, k1] 3 times, brSl, sl1-k2tog-psso, brSl, k1, repeat from * to last 2 sts, brSl, k1 (multiple of 10 sts, plus 4).
Row 15: BrSl, k1, *[brSl, k1] 4 times, brSl, sl1-k2tog-psso, repeat from * to last 2 sts, brSl, k1 (multiple of 10 sts, plus 4).