{{explanation}}
On 2nd chord 3c+4c cross to (1,2,3x,4x)

1–
: 2c+3c RHA ; 2W & 3W with P following cast L round 1W & 4W “=2cnrs”
9–
: 1M+2c & 3c+4M RHA ; 1W+2c & 3c+4W LHA
17–
: 2c (on M side) & 3c (on W side) (still in tandem, W leading) opposing Reels3 on sidelines, Lsh to 4W/1W “=4cnr”, to 2,1,4x,3x, middle Cs facing each other up/dn
25–
: 1c+4c set | cross RH on side ; set to P | cross RH (2,4,1x,3x)