CREATE TABLE table_30899 ("Episode" FLOAT, "First Air Date" TEXT, "Rating  ( 18\\u201349 ) " TEXT, "Share  ( 18\\u201349 ) " FLOAT, "Viewers  ( millions ) " TEXT, "Rank  ( timeslot ) " TEXT)

When 13 is the share (18-49) what is the rank (timeslot)?
SELECT "Rank (timeslot)" FROM table_30899 WHERE "Share (18\u201349)" = '13'
SELECT "Rank (timeslot)" FROM "table_30899" WHERE "Share (18\u201349)" = '13'