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1. no strict;  $x = qr/(??{ $x })/;
2. use strict; our $x = qr/(??{ our $x })/
3. use strict; our $x = qr/(??{ no strict; $x })/
4. use strict; our $x; $x = qr/(??{ $x })/
5. use strict; my $x; $x = qr/(??{ $x })/

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```
6. use strict; our $x = qr/(??{ $x })/
```