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    my ($x)
    
    my $x;
    my $y;
    my $z;
    
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    my ( $x , $y , $z );
    
    ...
         $y ,
         $z 
    );
    
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    sub function{
      my $self = @_;
    }
    
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    sub function{
      my ($self) = @_;
    }
    
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    sub function{
      my ($self , $arg1 , $arg2 ) = @_;
    }