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| 1 | () | true |
|---|
| 2 | {} | true |
| 3 | [] | true |
| 4 | ()() | true |
| 5 | (()) | true |
| 6 | []{} | true |
| 7 | {[]} | true |
| 8 | {(((({}))))} | true |
| 9 | ()[]{}([{}]) | true |
| 10 | ()[()]({[()]})([]) | true |
| 11 | ( | false |
| 12 | ] | false |
| 13 | {] | false |
| 14 | (} | false |
| 15 | ([)] | false |
| 16 | {((((})))) | false |
| 17 | {(((([))))}] | false |
| 18 | {(((([[[[{{} | false |
| 19 | ()[()]({[[(])]})([]) | false |