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  1. or download this
    $x = f( $o->next ) + g( $o->next );
$y = f( $o->next ) - g( $o->next );
  2. or download this
    $x =  g( $o->next ) + f( $o->next );
$y = -g( $o->next ) + f( $o->next );
  3. or download this
    my $temp1 = $o->next;
my $temp2 = $o->next;
...
$temp1 = $o->next;
$temp2 = $o->next;
$y = g( $temp1 ) - f( $temp2 );
  4. or download this
    my $temp1 = $o->next;
my $temp2 = $o->next;
...
$temp1 = $o->next;
$temp2 = $o->next;
$y = f( $temp1 ) - g( $temp2 );