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#!perl

...
    $x . $y . $z . $x . $y . $z . $x . $y . $z . $x . $y . $z .
    $x . $y . $z . $x . $y . $z . $x . $y . $z . $x . $y . $z;
}

$ bench_join_concat.pl
************************************************************
...
cat_3   6032896/s  1644%   1550%   779%    671%   339%    305%   127% 
+ 125%    29%    --    -6%  -37%
join_2  6390454/s  1748%   1647%   831%    717%   365%    329%   140% 
+ 139%    36%    6%     --  -33%
cat_2   9572936/s  2668%   2517%  1295%   1124%   597%    542%   260% 
+ 258%   104%   59%    50%    --