1–
: All W (1W leading) chase cclw behind Mline back to places (1,2,3,4)
9–
: All M (1M leading) chase clw behind Wline back to places (1,2,3,4)
17–
: 1c BHJ slip down ; and up (1,2,3,4)
25–
: All couples BHJ (4c leading) slip down ; 2c+3c+4c slip up under arch made by 1c (2,3,4,1)