protected function buildSuffix(array $strings)
	{
		$suffix = [[]];
		foreach ($strings as $string)
		{
			if ($this->isCharacterClassString($string))
			{
				foreach ($string[0] as $element)
				{
					$suffix[] = $element;
				}
			}
			else
			{
				$suffix[] = $string;
			}
		}

		return $suffix;
	}