How many episodes did Julie Martin wrote for the show If every episode has its own production code?
{'header': ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code'], 'page_title': '', 'section_title': '', 'caption': '', 'rows': [['56', '1', '"Hostage (Part 1)"', 'Ted Demme', 'James Yoshimura', 'September20,1996', '501'], ['57', '2', '"Hostage (Part 2)"', 'Jean De Segonzac', 'Julie Martin', 'September27,1996', '502'], ['58', '3', '"Prison Riot"', 'Kenneth Fink', 'Tom Fontana', 'October18,1996', '503'], ['59', '4', '"Bad Medicine"', 'Kenneth Fink', 'David Simon', 'October25,1996', '504'], ['60', '5', '"M.E., Myself and I"', 'Michael Fields', 'Lyle Weldon & Emily Whitesell', 'November1,1996', '505'], ['61', '6', '"White Lies"', 'Peter Weller', 'Anya Epstein', 'November8,1996', '506'], ['62', '7', '"The Heart of a Saturday Night"', 'Whit Stillman', 'Henry Bromell', 'November15,1996', '507'], ['63', '8', '"The True Test"', 'Alan Taylor', 'Noel Behn', 'November22,1996', '508'], ['64', '9', '"Control"', 'Jean De Segonzac', 'Les Carter & Susan Sisko', 'December6,1996', '509'], ['65', '10', '"Blood Wedding"', 'Kevin Hooks', 'Matthew Witten', 'December13,1996', '510'], ['66', '11', '"The Documentary"', 'Barbara Kopple', 'Eric Overmyer', 'January3,1997', '511'], ['67', '12', '"Betrayal"', 'Clark Johnson', 'Gay Walch', 'January10,1997', '512'], ['68', '13', '"Have a Conscience"', 'Uli Edel', 'James Yoshimura', 'January17,1997', '513'], ['69', '14', '"Diener"', 'Kyle Secor', 'Christopher Kyle', 'January31,1997', '514'], ['70', '15', '"Wu\'s on First?"', 'Tim McCann', 'David Simon & Anya Epstein', 'February7,1997', '515'], ['71', '16', '"Valentine\'s Day"', 'Clark Johnson', 'Tom Fontana', 'February14,1997', '516'], ['72', '17', '"Kaddish"', 'Jean De Segonzac', 'Linda McGibney', 'February21,1997', '517'], ['73', '18', '"Double Blind"', 'Uli Edel', 'Lee Blessing & Jeanne Blake', 'April11,1997', '518'], ['74', '19', '"Deception"', 'Peter Medak', 'Debbie Sarjeant', 'April25,1997', '519'], ['75', '20', '"Narcissus"', 'Jean De Segonzac', 'Yaphet Kotto', 'May2,1997', '520'], ['76', '21', '"Partners and Other Strangers"', 'Leslie Libman & Larry Williams', 'Anya Epstein, Julie Martin & Darryl LeMont Wharton', 'May9,1997', '521']]}