Alison McDonald เขียนกี่ตอน?ไม่จำเป็นต้องใช้ตารางทั้งหมด
How many episodes were written by Alison McDonald?It is not neccessary to use all the tables.
 table_26961951_4:  (directed_by [ VARCHAR ] written_by [ VARCHAR) ]
SELECT COUNT(directed_by) FROM table_26961951_4 WHERE written_by = "Alison McDonald"