1–3
: 1s followed by 2s lead down.  2s separate at the end of bar 3.
4–6
: 1s followed by 2s lead up.
7–8
: 1s cast while 2s continue leading to top place.  Order is now 2, 1, 3.
9–16
: 1s repeat with 3s.  Order is now 2, 3, 1.
17–24
: 2s and 3s RHA LHA.
25–32
: 1s cross R and cast up.  3s step down on 27–28.  1s cross up R between 2s and cast down.