{{explanation}}
Square set:  5M in centre with back to 3s, 5L with back to 1s

1-8
: 5M dances between 1s, 5L between 3s & they chase clockwise 1/2 round set
  & back into centre (5M thro' 3s, 5L thro' 1s) **while** 2s & 4s set,
  turn prtnr RH, set, turn LH
9-16
: 5s Tulloch Turn **while** 1s+2s+3s+4s dance interlocking reels of 4
  round set
17-24
: 5M+4M+1L also 5L+2M+3L set as Double Triangles, 5s pull back RSh dance
  1/4 round to right. 5M+1M+2L also 5L+3M+4L set as Double Triangles. 5s
  finish in centre facing 1s
25-40
: 5s+1s dance 1/2 R&L, then 1s+2s, 2s+3s etc 1/2 R&L until 4s in centre