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_18646111_13 (semifinals VARCHAR, class VARCHAR)
### Question:
Name the number of semifinals for tt2
### Answer:
SELECT COUNT(semifinals) FROM table_18646111_13 WHERE class = "TT2"