graph 02 { 
1 [label="a"]; 
2 [label="b"]; 
3 [label="c"]; 
4 [label="d"]; 
5 [label="e"]; 
6 [label="f"]; 
7 [label="g"]; 
1 -> 2 [label="1.8"]; 
2 -> 3 [label="1.3"]; 
2 -> 4 [label="0.9"]; 
2 -> 5 [label="2.5"]; 
4 -> 5 [label="1.5"]; 
4 -> 5 [label="3.1"]; 
5 -> 7 [label="1.7"];
7 -> 6  [label="6.2"];
1 [color=red]; 
2 [color=red]; 
3 [color=red]; 
4 [color=red]; 
5 [color=red]; 
}