 
   July 1, 1994                                                        SIS(1)
 
   invert node-list
 
     Invert each node in the node-list.  It is used when the complement of a
     node is to be implemented.  Note that it does not change the logic func-
     tion of the current Boolean network, but will have an effect on the
     structure of the network.
 
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