*1c & 3c start as in a square set with 2M in 2pl and 2W in 4pl, effectively as 1c & 2c crossed over*

1-
: All petronella to next side | set ; repeat, all are now opposite original place
9-
: 3c & 1c in promhold Reel4 with 2W/2M who start passing LSh to give RSh to 3c/1c at top/bottom, 2c end in original places (as at bar 1)
17-
: 3c+2M (top) & 2W+1c (bottom) RHA, 2c pass RSh ; 3c+2W & 2M+1c LHA
25-
: All set | 3M+2M & 3W+2W turn 1&frac12; BH **while{4}** 1c turn BH once | all set in progressed places (2x,3x,1)