CREATE TABLE table_name_13 (inf_stem VARCHAR(255), subj_pres VARCHAR(255), plur_pret VARCHAR(255))
What is the infinitive stem that is associated with a subjunctive present of a and a plural preterite of uo?
    
SQL: SELECT inf_stem FROM table_name_13 WHERE subj_pres = "a" AND plur_pret = "uo"