1-8
: 1s make arch & 2s lead up under arch & cast back to place; 2s & 3s dance
  RH across
9-16
: 4s make arch & 3s dance down under & cast back to place; 2s & 3s dance
  LH across
17-24
: 1s cast off to bottom (4 bars); 2s+3s+4s make arches, 1s dance up to top
  under the arches
25-32
: 1s followed by 2s+3s+4s cast to bottom; 1s make arch & 2s+3s+4s dance
  under to new places 2 3 4 1