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Select or download this
```
{ a => undef } ~~ sub { $_[0] eq 'a' }
```
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```
sub { $_[0] eq 'a' } ~~ { a => undef }
```
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```
sub { $_[0] eq 'a' } ~~ { a => undef }
```
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```
'b' ~~ { a => undef }
```
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```
undef ~~ \%hash
```