Which species show a negative result with both voges-proskauer and indole?
CREATE TABLE "usage" (
  "species" text,
  "indole" text,
  "methyl_red" text,
  "voges_proskauer" text,
  "citrate" text
);
SELECT "species" FROM "usage" WHERE "voges_proskauer"='Negative' AND "indole"='Negative';