{{explanation}}
4c+5c+6c start on opposite sides (1,2,3,4x,5x,6x)

1–
: 1c+2c+3c & 4c+5c+6c each circle6 and back
9–
: ½ G-Chain (6 hands), starting across at the ends (to 6,5,4,3x,2x,1x)
17–
: Top, middle and bottom pairs of couples set, ½RHA ; end couples wait **while{4}** 6c+3c & 4c+1c set, ½LHA (to 5x,3x,6,1x,4,2)
25–
: Middle-most couples (1c+6c) face each other, set and change places RH ; all C set and cross RH (to 5,3,1,6x,4x,2x)