CREATE TABLE table_23858 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directedby" TEXT, "Writtenby" TEXT, "Originalairdate" TEXT, "Production code" TEXT, "U.S.viewers  ( million ) " TEXT)

How many numbers in the season were written by Brett Conrad & Liz Sagal?
SELECT COUNT("No. in season") FROM table_23858 WHERE "Writtenby" = 'Brett Conrad & Liz Sagal'
SELECT COUNT("No. in season") FROM "table_23858" WHERE "Writtenby" = 'Brett Conrad & Liz Sagal'