7
A
B
C
D
E
F
G

"A" "B" 2
"A" "C" 1
"A" "D" 2
"A" "E" 3
"A" "G" 3
"B" "C" 1
"B" "E" 1
"B" "F" 2
"C" "D" 1
"C" "F" 1
"D" "F" 2
"D" "G" 1
"E" "F" 2
"E" "G" 3
"F" "G" 2