1-6
: 1s cast 1 place & circle 3H round to left (1L with 2s & 1M with 3s)
7-12
: 1s circle 3H round to right (with same couple) & turning left about
  dance out own sides casting left to face 1st corners
13-18
: 1s turn 1st corners RH, turn partner LH & face 2nd corners
19-24
: 1s turn 2nd corners RH & cross LH to 2nd place own side