Half of 28 Doubler 34 14 68 Half of 20 Half of 80 Double 18 Half of 26 10 40 36 13 80 Half of 160 Double 7 14 Half of 2 1 1 14 13 Half of 2
36 Double 7
40 80 10 Half of 26
68 Double 18
14 Half of 80
Half of 20
Double 21
Double 34
Half of 28
42