CREATE TABLE table_47991 ("Year" FLOAT, "Network" TEXT, "Title" TEXT, "Notes" TEXT, "Language" TEXT)

What are the notes for the Mandarin Chinese program on CTV earlier than 2013?
SELECT "Notes" FROM table_47991 WHERE "Year" < '2013' AND "Language" = 'mandarin chinese' AND "Network" = 'ctv'
SELECT "Notes" FROM "table_47991" WHERE "Language" = 'mandarin chinese' AND "Network" = 'ctv' AND "Year" < '2013'