code: def _is_search_key_by_values(self, column: pd.Series) -> bool:
      if not is_string_dtype(column):
          return False
  
      all_count = len(column)
      is_countries_count = len(
          column[
              column.astype("string")
              .str.upper()
              .isin(self.COUNTRY_CODES)
          ]
      )
      return is_countries_count / all_count > 0.1
  
file_path: upgini/src/upgini/utils/country_utils.py
imports: import pandas
  from pandas.api.types import is_string_dtype
  from upgini.utils.base_search_key_detector import BaseSearchKeyDetector
label_desc: Use image node_id 2 for calling the CountrySearchKeyDetector obj's underlying member method code with example usage: obj._is_search_key_by_values(column) and returns: unknown, False