1-8
: 1s cast down own sides, turn out & cast back to top
9-16
: 1s lead down the middle & back to end 1L between 2s facing down & 1M
  between 3s facing up
17-24
: 2s+1s+3s set twice with 1s turning onto own sides, 2s+1s+3s set twice
25-32
: 2s+1s+3s circle 6H round & back