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```
use strict;
use warnings;
```

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$ perl -E 'my (@x, @y); say defined(@x) ? 1 : 0; say defined(@y) ? 1 :
+ 0'
Can't use 'defined(@array)' (Maybe you should just omit the defined()?
+) at -e line 1.
...
$ perl -E 'my (@x, @y); say @x ? 1 : 0; say @y ? 1 : 0'
0
0