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

1-8
: All Adv+Ret, 1s & 4s pass partner RSh & turn next person with nearer
  hand to end 2 (1) 4 (3), 1s & 3s remain facing out
9-16
: 2s+1s & 4s+3s dance full Figs of 8 (2M & 3M remain facing out)
17-24
: 2s+1s & 4s+3s dance Ladies' Chain
25-32
: 1s & 4s dance RH across 1/2 way, 1/2 turn nearer corner LH, 2s & 3s
  dance RH across 1/2 way & turn nearer corner LH
33-40
: 1s & 4s dance 'Hello-Goodbye' setting to end 1s in centre facing up & 4s
  facing down
41-48
: 1s & 4s dance out ends of the set & cast in to 2nd & 3rd place & dance
  1/2 Figs of 8 round top / bottom couples to end 3 1 (4) (2)