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$exp[12] = undef;
printf "%d,%d,%d,%d\n", exists $exp[11], exists $exp[12], exists $exp[
+13], scalar @exp;
printf "%d,%d,%d,%d\n", defined $exp[11], defined $exp[12], defined $e
+xp[13], scalar @exp;

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```
0,1,0,13
0,0,0,13
```