#Clos network with 12 terminal nodes and 11 switches
23 4

 0 B 12
 1 R 12
 2 R 12
 3 R 13
 4 R 13
 5 R 13
 6 R 14
 7 R 14
 8 R 14
 9 R 15
10 R 15
11 R 15
12 N 16 17 18
13 N 16 17 18
14 N 16 17 18
15 N 16 17 18
16 N 19 20 21 22
17 N 19 20 21 22
18 N 19 20 21 22
19 N  0  1  2
20 N  3  4  5
21 N  6  7  8
22 N  9 10 11
