Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_42750 ( "Inf. Stem" text, "Sing. Pres." text, "Plur. Pres." text, "Sing. Pret." text, "Plur. Pret." text, "Subj. Pres." text, "Subj. Pret." text, "Past Part." text )

### Question ###
What is the infinitive stem that is associated with a subjunctive present of a and a plural preterite of uo?

### Accurate SQL ###

SELECT "Inf. Stem" FROM table_42750 WHERE "Subj. Pres." = 'a' AND "Plur. Pret." = 'uo'