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  1. or download this
                $str =~ s/\s+/ /g;
            $str =~ s/^\s+//;
            $str =~ s/\s+$//;
  2. or download this
                $str =~ s/\s+/ /g;
            $str =~ s/^\s//;
            $str =~ s/\s$//;
  3. or download this
    Short string:
            Rate   3-sp_r 3-sp_r2  3-sp
...
3-sp    20911/s     --   -12%    -38%
3-sp_r  23687/s    13%     --    -29%
3-sp_r2 33582/s    61%    42%      --