CREATE TABLE table_24456 ("No." FLOAT, "#" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "U.S. viewers  ( million ) " CLOB, "Original air date" CLOB, "Production code" FLOAT)

Name the total number of production code for episode by steve cohen & andrew dettman
SELECT COUNT("Production code") FROM table_24456 WHERE "Written by" = 'Steve Cohen & Andrew Dettman'
SELECT COUNT("Production code") FROM "table_24456" WHERE "Written by" = 'Steve Cohen & Andrew Dettman'