protected function getByeGroup($fighters)
    {
        $fighterCount = $fighters->count();
        $firstRoundGroupSize = $this->firstRoundGroupSize(); // Get the size of groups in the first round (2,3,4)
        // Max number of fighters for the first round
        $treeSize = $this->getTreeSize($fighterCount, $firstRoundGroupSize);
        $byeCount = $treeSize - $fighterCount;
        return $this->createByeGroup($byeCount);
    }