Modified:
Cast on 100; first 10 rows as written.
Next row; first 4 stitches reduced to two in kind, and every 5th set of four repeated. +9 rows worked even. Reduced by 10 stitches.
Next row; first 2 stitches absorbed and every two stitch rib after. +4 rows worked even. Reduced by 10 stitches.
Next row; reduce every center double rib set to a single rib set. +4 rows worked even. Reduced by 10 stitches.
Next row; absorb every single rib set. +4 rows worked even. Reduced by 10 stitches.
Stretchy bind-off.