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_56 (period VARCHAR, matches VARCHAR, country VARCHAR)
### Question:
Name the period with matches of 0 0 of portugal
### Answer:
SELECT period FROM table_name_56 WHERE matches = "0 0" AND country = "portugal"