1:0 2:1 3:2 4:3 5:4 
[0]=10 [1]=20 [2]=30 
dot=300
arrow-range s=6
arrow-coll t=60
v7 v8 v9 
escape n=3
1/10/100 2/20/101 3/30/102 4/40/103 
after ref: 1 3 5 7