6 12 graph
"a" 150 50
"b"  50 100
"c"  50 200
"d" 150 250
"e" 250 200
"f" 250 100
"" a b 21
"" a c 7
"" a e 6
"" a f 5
"" b c 16
"" b d 8
"" b f 4
"" c d 3
"" c e 12
"" d e 9
"" d f 14
"" e f 2