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  1. or download this
    my $scalar = $untied_var1 <op> $untied_var2;
my $scalar = func1() <op> $untied_var;
my $scalar = $untied_var <op> func1();
  2. or download this
    my $scalar = func1() <op> func2();
my $scalar = $tied_var1 <op> $tied_var2;
...
my $scalar = func1() <op> $tied_var;
my $scalar = $obj1->method() <op> $obj2->method();
# and all the other combinations