void updateNet(){
  //... check network for next visited links
  
  
  for(int u = 0 ; u < on.length; u++){
    if(!visited[u]){
      // see if it should be updated
      // check the toCheck array for linked members
      for(int c = 0; c < on.length; c++){
        //if they arec connected, and the one to check is on, turn this one on
        if(network[c][u] && on[c]){
          on_next[u] = true;
          visited_next[u] = true;
        }
      }
    }
  }
  
  // turn the current ones off
  for(int i = 0; i < on.length; i++){
    if(on[i]) on_next[i] = false;
  }
  
  // time step
  for(int i = 0; i < on.length; i++){
    on[i] = on_next[i];
    visited[i] = visited_next[i];
  }
  for(int i = 0; i < on.length; i++){
    on[i] = on_next[i];
    visited[i] = visited_next[i];
  }
  
}

boolean allHaveBeenVisited(){
  boolean toReturn = true;
  for(int i = 0; i < on.length; i++){
    if(!visited[i]){
      toReturn = false;
      break;
    }
  }
  return toReturn;
}