Communication protocols

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1. $B%0%i%U$N@-
   • BFS
   • DFS

2. $B%b%G%kKh$NHf3S(B
   • BFS levels
   • In-degree
   • Out-degree
   • DFS_depth
   • DFS_cycle
   • DFS_stack
   • Back level edge length
   • Error states