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

1–
: 1c+4c set | Turn RH ; cast inwards (2c+3c to the ends) | turn RH ½ into promhold (W on L) facing 2W and 3W
9–
: 1c+4c in promhold “Pass and Turn”with 2W+3W ; repeat with 2M+3M, and finish 1c between 2c and 4c between 3c in facing lines across
17–
: All set | 1c+4c change places LH with opposite ; lead out crossing and cast in to (2,4,1x,3x)
25–
: 1c+4c change places LH on side, lead out the end, cross and cast back | ½ RHA (2,4,1x,3x)