Errata
There are mistakes in the instructions for the lace on the legs of the socks. The pattern should read:

Round 13 *K4, yo, k2tog, K3, P1, K2, P1, K2, P1; repeat from * to end
Round 14 *K9, P1, K2, P1, K2, P1; repeat from * to end
Round 15 *K1, yo, sl2, K1, pass the slipped sts over, yo, K1, yo, sl2, K1, pass the slipped sts over, yo, K1, P1, K2, P1, K2, P1; repeat from * to end
Round 16 *K9, P1, K2, P1, K2, P1; repeat from * to end

Repeat these last 4 rounds until work measures approx 6in (15cm) from cast on edge. Finish after round 14 in the pattern, stopping 3 sts before the end of the round to position the heel.