Table schema:
CREATE TABLE table_name_54 (class VARCHAR, call_sign VARCHAR, erp_w VARCHAR, frequency_mhz VARCHAR)

Question: Which Class has a ERP W larger than 205, and a Frequency MHz smaller than 93.9, and a Call sign of k210cb?
SQL: SELECT class FROM table_name_54 WHERE erp_w > 205 AND frequency_mhz < 93.9 AND call_sign = "k210cb"