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        if ( not $code ) {
        $code       = $unit;
...
        @ARGV       = @$argv;
    }
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        if ( $A ) {
        if ( $B ) {
...
            {...}
        };
    };
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        # Four-outcome tree
    my $cf      = !!$code;
...
        $code       = $unit . q{()};
    } 
    else { die 'Fifth element!' };