text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_name_24 (call_sign VARCHAR, erp_w VARCHAR, class VARCHAR, frequency_mhz VARCHAR)
  ### Question:
  Class of d, and a Frequency MHz smaller than 107.7, and a ERP W smaller than 232 has what call sign?
  ### Answer:
  SELECT call_sign FROM table_name_24 WHERE class = "d" AND frequency_mhz < 107.7 AND erp_w < 232