 
   July 1, 1994                                                        SIS(1)
 
   print_io [-d] [node-list]
 
     Print both fanin and fanout list for each node in the node-list.
     Absence of node-list implies all the nodes in the current network.
 
     If the -d option is specified, the nodes in the external don't care net-
     work are considered.
 
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