{{explanation}}
3s & 4s on opposite sides

1-8
: 1s & 4s dance 1/2 Figs of 8 round 2s/3s & end between 2s/3s in lines
  across, 1s+2s Adv+Ret as 4s+3s Ret+Adv
9-16
: All dance reels of 4 across 1s & 4s end in middle BtoB facing corners
17-24
: 1s & 4s dance 'Hello-Goodbye' setting & on bars 23-24 end with1M & 4M
  crossing RH to face out (1M on L side, 4M on M side) **while** others
  PdB turning around as 4L ends facing down between 2s & 1L facing up
  between 3s
25-32
: 1M & 4M followed by partners cast to right around corner (3M/2M) into
  centre, loop round to right & cast around next corner (3L/2L) then
  cross to other side to end 2 4 (1)(3)