h2. Exemplu
table(example). |_. arbore3.in |_. arbore3.out |

| 8 5
0 1
1 3
2 1
2 2
1 7
5 -4
6 5
6 2
| 4

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h3. Explicaţie

Cele $4$ lanturi sunt $(1, 2, 3)$, $(3, 2)$, $(5, 6, 8)$ si $(7)$.

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