1W+3M cross, and with P in promhold (M on L) cast L round 2c, cross, and cast L round 2c to middle, 1c (on opposite side) facing 3c while{8} 2c wait{2} | set ; turn RH and face 1c (1x,2,3)
9-16
Reels 3 on the sides, 1c cross down to start (1,2,3)
17-20
1c+2c ½ R&L while{4} 3c set and cross RH (2x,1x,3x)