public void list(PrintStream out,int indent){
  for (int i=0; i < indent; i++) {
    out.print(" ");
  }
  out.println(this);
}

public void list ( PrintStream out , int indent ) { for ( int i = 0 ; i < indent ; i ++ ) { out . print ( " " ) ; } out . println ( this ) ; }
prints out a list , starting at the specified indentation , to the specified print stream .
