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In Perl, how to use 'defined' function on elements of two-dimensional array?
| Author | Votes | Δ |
|---|---|---|
| Tim | 7 | +3.74 |
| hobbs | 5 | +0.85 |
| ikegami | 3 | -0.34 |
| TLP | 3 | -0.33 |
| Pavel Vlasov | 2 | -2.47 |
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