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perl -w -MData::Dumper -e '
@old = ( "10.5 AA", "9 AC", "2 BB");  
@new = sort {$b <=> $a} @old; 
print Dumper \@new;'

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Argument "10.5 AA" isn't numeric in sort at -e line 1.
Argument "9 AC" isn't numeric in sort at -e line 1.
...
          '9 AC',
          '2 BB'
        ];