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Line 12:
Line 12: − + − + − + + + + + + +
→Examples
{| class="wikitable"
{| class="wikitable"
|-
|-
| 2 3 4
|
|| 6 7 8
2 3 4
|| 10 11 12
||
6 7 8
||
10 11 12
|}
|}
|
5 6 7
5 6 7