CREATE TABLE table_31397 ("No. in series" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" FLOAT, "U.S. viewers  ( million ) " TEXT)

How many millions of U.S viewers watched the episode written by Liz Feldman?
SELECT "U.S. viewers (million)" FROM table_31397 WHERE "Written by" = 'Liz Feldman'
SELECT "U.S. viewers (million)" FROM "table_31397" WHERE "Written by" = 'Liz Feldman'