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```
my @array = (1,2,3,4,5);
```

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$_ *= 2 for 1,2,3,4,5; # doesn't work because you're modifying constan
+ts.

@a = (1,2,3,4,5);
$_ *= 2 for @a; # modifies @a because @a has copies of the constants i
+nstead of the constants themselves