Butterfly Wings
4 Couple Longways Diff: 6 0
32 Bars N Progression
A1 LLFB, Middles gate through nearest end
A2 Double figure of 8 (middles cross, ends cast)
B1 Cast from ends, ends meet opposite and make a single handed arch, Middles meet Neighbour, go under arch and meet opposite, with that opposite lead to nearest end
B2 All 2HT the one you've got 3/2 (ends across set, middles along line) All Partner DoSiDo (across set)
2 & 4 improper. After once through, middles and ends have swapped, (old) ends have same partner, middles have new partner.