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_2651755_2 (alliance VARCHAR, democratic_coalition VARCHAR)
### Question:
where democratic coalition is eduardo frei ( pdc ) what are all the alliance
### Answer:
SELECT alliance FROM table_2651755_2 WHERE democratic_coalition = "Eduardo Frei ( PDC )"