CREATE TABLE table_3081 ("No. in series" TEXT, "No. in season" TEXT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT)

Who write episode number 48 in the series?
SELECT "Written by" FROM table_3081 WHERE "No. in series" = '48'
SELECT "Written by" FROM "table_3081" WHERE "No. in series" = '48'