1-8
1c set | cast off ; turn 1¼ LH to centre line
9-12
2c+1W & 1M+3c RHA, 1c end BtoB, 1M/1W facing down/up
13-24
Revolving Double Triangles: all set as DTr, on [14] 1c pull RSh back | 1c quickly pass P RSh to 2cnr place while{2} 2cnrs cast off/up on side while{2} 1cnrs petronella turn (skip change) to end BtoB in centre ; repeat [13-16] twice, 1c ending BtoB in centre, 1M/1W facing down/up
25-32
1c cast RSh round 4cnr to 2pl ; all turn P RH (2,1,3)