code: public static function formatCamelCaseWithAcronyms(array $parts)
      {
          $camelCase = array_map(function($p) {
              return static::ucfirstAndLowerNonAcronym($p);
          }, $parts);
  
          if (static::isAcronym($camelCase[0])) {
              return implode('', $camelCase);
          }
  
          return lcfirst(implode('', $camelCase));
      }
docs: Inherit Doc from Interfaces\Formatter