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> library(PAFit)
> 
> 
> net <- generate_BA(N = 100, multiple_node = 20, m = 1)
> 
> system.time(b <- to_igraph(net))
   user  system elapsed 
   0.01    0.00    0.02 
> 
> #plot(network.extract(b,at = 6))
> 
> proc.time()
   user  system elapsed 
   1.71    0.29    2.00