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$ perl -e '@a = (1 2 3 4); $y = join ",", @a'
Number found where operator expected at -e line 1, near "1 2"
...
    (Missing operator before  4?)
syntax error at -e line 1, near "1 2"
Execution of -e aborted due to compilation errors.

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```
@a = (qw{1 2 3 4})
```