{{explanation}}
3c+4c begin the dance on opposite side (1,2,3x,4x)

1–
: All C cross RH, set ; repeat to place.
9–
: 1c+4c 1½ RH turn ; cast to the middle (2c+3c step to the ends) | ½ LHA staying in the middle
17–
: 1c+4c change places RH with "corner" (1M with 3W, etc) putting cnrs BtB in the centre | all set, facing diagonally ; change back RH | 1c+4c ½ LHA
25–
: Repeat [17–22] with "opposite corner" (1M with 2W, etc), at end 1c faces 4c on sideline | 1c+4c change places LH. (to 2,4,1x,3x)