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use v5.10;  
use warnings;
...
    when( [ 6..10 ] ) { say "$_ : Matched 6 through 10" }  
    default     { say "$_ : Matched nothing" }  
}

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a : Matched an a
Argument "z" isn't numeric in smart match at C:\b\perlmonks\switch.pl 
+line 7.
...
9 : Matched 6 through 10
10 : Matched 6 through 10
11 : Matched nothing