1-
: 1c+2c & 3c+4c ½ R&L ; 2c+1c & 4c+3c Set&Link (1x,2x,3x,4x)
9-
: 1c+2c & 3c+4c RHA ; all chase clw ½ (4,3,2,1)
17-
: All set | 3c (3M leading) & 1c (1M leading) chase clw ½ to exchanged places {4} | 3c & 1c pass P RSh to own sides (4,1,2,3)
25-
: Circle8 and back
*Deviser's note* : bars 21-24 should be loops since you are inscribing the yin-yang symbol.