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_13 (inf_stem VARCHAR, subj_pres VARCHAR, plur_pret VARCHAR)
### Question:
What is the infinitive stem that is associated with a subjunctive present of a and a plural preterite of uo?
### Answer:
SELECT inf_stem FROM table_name_13 WHERE subj_pres = "a" AND plur_pret = "uo"