protected function estimateSavings()
	{
		$this->savings = [];
		foreach ($this->getStringsFrequency() as $str => $cnt)
		{
			$len             = strlen($str);
			$originalCost    = $cnt * $len;
			$replacementCost = $cnt * 2;
			$overhead        = $len + 6;

			$this->savings[$str] = $originalCost - ($replacementCost + $overhead);
		}
	}