CREATE TABLE table_73475 ("No. in series" CLOB, "No. in season" CLOB, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" CLOB, "U.S. viewers  ( millions ) " CLOB)

Name the production code by paul lieberstein
SELECT "Production code" FROM table_73475 WHERE "Written by" = 'Paul Lieberstein'
SELECT "Production code" FROM "table_73475" WHERE "Written by" = 'Paul Lieberstein'