1–
: 1c set to 3c | change places with opposite person RH ; face R and chase clw outside the set to partner's place
9–
: 2c+4c repeat
17–
: 2M & 4M join NH with W on their R (=1W & 3W respectively) and A&R on diagonal ; 3M & 1M repeat with W on their R.
25–
: Circle8 and back. all M to original places, with new partner.