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_21 (suffix VARCHAR, valency_change VARCHAR, type VARCHAR)
### Question:
What is the Suffix of the intensive and valency change of 0?
### Answer:
SELECT suffix FROM table_name_21 WHERE valency_change = "0" AND type = "intensive"