Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_30 (set_1 VARCHAR, set_2 VARCHAR, set_4 VARCHAR, score VARCHAR)

### Question ###
What is Set 1, when Set 4 is NA, when Score is 3-0, and when Set 2 is 29-27?

### Accurate SQL ###

SELECT set_1 FROM table_name_30 WHERE set_4 = "na" AND score = "3-0" AND set_2 = "29-27"