1-
: 1c lead down the middle and up, 2c step in on bar 8 for
9-
: 1c+2c allemande, 1c finishing facing 1cnr
17-
: Modified Cnrs Pass&Turn : 1c dance normally, but cnrs turn RH ½ and twirl R to exchanged places (3x,1x,2x)
25-
: Set&Rotate for three [All Set | all cast clw to lines across ; all cpls change place RH | all chase clw] (2x,1x,3x)

{{explanation}}
The set is now inverted ; repeat using the bottom (3c) as new top.