1-8
: 1s lead down below 3s, cross & cast up to 2nd place opp sides (2s step
  up); 1s cross RH, cast to Right to 1M between 2s 1L between 3s
9-12
: 1s turn 3/4 RH, turn 1st corners LH into lines across facing 4th
  corners, 1L taking 1st corner in prom hold (1L on the L), 1M alone
13-16
: 1s loop LSh round 4th corners back to same place,1L releases prom
  hold, **while** 4th corners pass 1s LSh into centre and turn LH back
  to place
17-20
: Repeat 9-12 with 2nd corners: 1s 3/4 turn LH, turn 2nd corner LH to face
  3rd corners, 1L taking 2nd corner in prom hold (1L on the R)
21-24
: Repeat 13-16 with 3rd corners: 1s loop RSh **while** 3rd corners pass 1s
  RSh into centre and turn RH back to place
25-32
: All chase 1/2 way clockwise then 1s turn 1.1/4 RH **while** corners
  continue chase back to place. End 2 1 3