SELECT set_1 FROM table_name_30 WHERE set_4 = "na" AND score = "3-0" AND set_2 = "29-27"
What is Set 1, when Set 4 is NA, when Score is 3-0, and when Set 2 is 29-27?
CREATE TABLE table_name_30 (
    set_1 VARCHAR,
    set_2 VARCHAR,
    set_4 VARCHAR,
    score VARCHAR
)