What is the infinitive stem that has a subjunctive present of ou?
CREATE TABLE "strong_verb_vowel_alternation_table" (
  "inf_stem" text,
  "sing_pres" text,
  "plur_pres" text,
  "sing_pret" text,
  "plur_pret" text,
  "subj_pres" text,
  "subj_pret" text,
  "past_part" text
);
SELECT "inf_stem" FROM "strong_verb_vowel_alternation_table" WHERE "subj_pres"='ou';