{{explanation}}
2s start on opp sides

1-8
: 1L+2M also 2L+3M set & turn RH on sides, 1M+2L also 2M+3L set & turn LH
  on sides
9-16
: 2s set & cross RH, all dance 1/2 reels of 3 on sides (1M+2M also 2L+3L
  giving RSh to start)
17-24
: 2s set & cross LH, all dance 1/2 reels of 3 on sides (1M+2L also 2M+3L
  giving LSh to start)
25-32
: All turn partners 2H twice & chase clockwise 2 places to face new
  partners (centre couple 3L & 1M on opp sides)