3. On a unit cube, a vector was drawn along each edge in one of the two possible directions. On each face, one diagonal was chosen and a vector was drawn along it in one of the two possible directions, and the 6 drawn diagonals turned out to be non-parallel. In total, 18 vectors were obtained. What is the maximum value that the square of the sum of these vectors can take?
Answer: 116

## Examples of how to write the answer:

## 1,7

$1 / 7$

17

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