# Optimal (5,2)=24 graph
# J.-C. Bermond, C. Delorme and G. Fahri. Large graphs with given degree and diameter III. 
#   Proc. Coll. Cambridge. 1981; Ann. Discrete Math. 13 (1982), 23-32. doi:10.1016/S0304-0208(08)73544-8
# 
# K3xX8  drawing  https://sagecell.sagemath.org/?q=yxlege
#              properties   https://sagecell.sagemath.org/?q=xlwugy
#
0 3 6 7 12 20
1 3 4 7 13 21
2 3 5 7 14 22
3 15 23
4 5 6 8 16
5 6 9 17
6 10 18
7 11 19
8 11 14 15 20
9 11 12 15 21
10 11 13 15 22
11 23
12 13 14 16
13 14 17
14 18
15 19
16 19 22 23
17 19 20 23
18 19 21 23
19
20 21 22
21 22
22
23