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    my $data = do {local $/; <DATA>};
    
    ...
    { { { } } }
    { { } { { { } } } }
    { ... }
    
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    <7> { ... } </7>
    <7> { { } } </7>
    { <7> { { } } </7> }
    { <3> { } </3> { <7> { { } } </7> } }
    <7> { ... } </7>
    
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    <7> { ... } </7>
    <7> { { } } </7>
    <11> { { { } } } </11>
    <19> { { } { { { } } } } </19>
    <7> { ... } </7>
    
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    Global symbol "$braces_re" requires explicit package name at (re_eval 
    +1) line 2.
    
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    my $braces_re;
    $braces_re = qr/