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  1. or download this
    12:40 >perl 1936_SoPW.pl
print (...) interpreted as function at 1936_SoPW.pl line 74.
Useless use of a constant ("\n") in void context at 1936_SoPW.pl line 
+74.
  2. or download this
    print ($graph->plot(\@point)) , "\n" ;
  3. or download this
    print +($graph->plot(\@point)) , "\n" ;
  4. or download this
    print $graph->plot(\@point), "\n" ;