Additional Materials:
- Cable Needle

Errata discovered August 14th, 2010
While decreasing for the gussets, you should just continue the cable pattern on needles 2 and 3 as established. You will have a k2 rib on each side on the instep that will no longer work into a cable (because half of each of those cables was incorporated in the heel flap, so you will just knit these sts. So, on Needles 2 and 3, you will p1, k2, p2, work cable pattern as established over next 32 sts, k2, p2, k1. You will have 104 sts at the beginning of the gussets - 31 sts on Needle 1, 21 sts each on Needles 2 and 3, and 31 sts on Needle 4.