ComplexLoopTopo.py

# Complex Multi-Loop Topology:
# 1 --- 2 --- 3 --- 4
# |     |     |     |
# |     |     |     |
# 5 --- 6 --- 7 --- 8
# |     |     |     |
# |     |     |     |
# 9 --- 10 -- 11 -- 12
#       |     |
#       |     |
#        \   /
#         13

topo = { 1 : [2, 5], 
         2 : [1, 3, 6],
         3 : [2, 7, 4], 
         4 : [3, 8],
         5 : [1, 6, 9], 
         6 : [2, 5, 7, 10],
         7 : [3, 6, 11, 8],
         8 : [4, 7, 12], 
         9 : [5, 10],
         10: [6, 9, 11, 13],
         11: [7, 10, 12, 13],
         12: [8, 11],
         13: [10, 11] }