1-8
: 1s lead down, cross below 3s & cast back to opposite places, 2s
  following on bar 3 & 3s cross over on bar 5, 1s+2s+3s cross back to
  orig places
9-16
: 1s cast 1 place, cross passing LSh cast round 1st corner to meet in
  centre & turn about into Double triangle position up/down dance
17-24
: 1L with 2s & 1M with 3s set, 1s dance up/down dance & cast round 4th
  corner into Double Triangle position facing own sides & set with crnrs
25-32
: 1s dance reels of 3 on own sides passing 4th corner RSh