1-8
: 1s set. 1L followed by 1M cast behind 2L & 3L, dance up middle to
  below 2M (2s step up)
9-16
: 1s+2M+3M dance Alternating Tandem Reel of 3 (1s+2M pass RSh).  1L
  followed by 1M ends below 2L
17-24
: 1s+2L+3L dance Alternating Tandem Reel of 3 (1s+2L pass LSh).  1s end in
  middle facing up, 1L followed by 1M
25-32
: 1s dance up, cast to 2nd place own sides.  2s+1s+3s turn partners RH