ROW 4: Sc next 24 sts, pick up white sc next 24, ch-1, turn.
ROW 5: Sc next 3 sts, (2 sc next sc next 4) 4 times, 2 sc next, pick up black, sc next 4, (2 sc next, sc next 4) 3 times, 2 sc next, sc next 3, 2 sc next, ch-1, turn. (58 sts)
ROW 6-11: Sc next 29 sts, pick up white sc next 29, ch-1, turn. Work alternating threads as established in pattern
RND 12: Lap last 2 sts of this rnd over 1st 2 sts, working through both thicknesses, sl st in last st and 1st st, sl st in 2nd to last st and 2nd st, ch-1, sc in same st as ch-1, sc next 27, pick up white sc next 28, sl st top beg sc, ch-1, turn. (56 sts)
RND 13-15: Sc next 28 sts, pick up black, sc next 28, sl st top beg sc, ch-1, turn. Work alternating threads as establish in pattern.
RND 16: Sc next 10 sts, sc next 2 sts tog as 1 (sc dec), sc next 16, pick up white, sc next 16, sc dec next 2, sc next 10, sl st top beg sc, ch-1, turn. (54 sts)
RND 17-19: Sc next 27 sts, pick up black, sc next 27, sl st top beg sc, ch-1, turn. Work alternating threads as established in pattern.
RND 20: Sc next 10 sts, sc dec next 2, sc next 15, pick up white, sc next 15, sc dec next 2, sc next 10, sl st top beg sc, ch-1, turn. (52 sts)
RND 21-23: Sc next 26 sts, pick up black, sc next 26, sl st top beg sc, ch-1, turn. Work alternating threads as established in pattern.
RND 24: Sc next 10 sts, sc dec next 2, sc next 14, pick up white, sc next 14, sc dec