1-4
: 1s set & cast (2s step up)
5-16
: 2s+1s+3s dance R&L for 3 couples 2 1 3
17-24
: 1L+2s also 1M+3s dance RH across; 1s pass RSh to dance LH across with
  other couple
25-32
: 1s+3s Set+Link; 3s+1s circle 4H round to left.  2 3 1