{{explanation}}
3s & 4s start on opp sides

1-8
: 1M dances full reel of 3 with 2s (LSh to 2L) picking up partner on
  bar 4 **while** 4M reels with 3s & picks up partner on bar 4 & end
  facing in centre
9-16
: 1s+4s set, dance RH across & dance up/down to opposite original places
17-24
: All facing on sides dance Grand Chain
25-32
: All set, 1s+2s also 3s+4s change pl on sides RH, 1s+4s change pl on
  sides LH & top 2 couples also bottom couples circle 4H round to left