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# This software is Copyright 2005 by Elsevier Inc.  You may use it
# under the terms of the license at http://perl.plover.com/hop/LICENSE
+.txt .
###
...
my $it = upto(3,5);
my $value->it();
print "$value\n";

sub upto {
  my ($m, $n) = @_;
  return Iterator {
...
  };
}
sub Iterator (&) { return $_[0]; }