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  1. or download this
    my $source_file = defined($options{o}) ? $options{o} : 'as.xcf-dist';
    
  2. or download this
    my $source_file = 'as.xcf-dist';
    $source_file = $options{o} if defined($options{o});
    
  3. or download this
    my $source_file = $options{o};
    $source_file = 'as.xcf-dist' if !defined($options{o});
    
  4. or download this
    sub defined_or { defined($_[0]) ? $_[0] : $_[1] }
    my $source_file = defined_or( $options{o}, 'as.xcf-dist' );
    
  5. or download this
    # Requires 5.10
    my $source_file = $options{o} // 'as.xcf-dist';