CREATE TABLE table_21826 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" FLOAT)

How many episodes did Alison Maclean direct?
SELECT COUNT("Written by") FROM table_21826 WHERE "Directed by" = 'Alison Maclean'
SELECT COUNT("Written by") FROM "table_21826" WHERE "Directed by" = 'Alison Maclean'