Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Episode No. | Title | Directed by | Written by | Original air date | Production code |
| --- | --- | --- | --- | --- | --- |
| 1.0 | " Serenity " | Joss Whedon | Joss Whedon | December 20, 2002 | 1AGE79 |
| 2.0 | " The Train Job " | Joss Whedon | Joss Whedon & Tim Minear | September 20, 2002 | 1AGE01 |
| 3.0 | " Bushwhacked " | Tim Minear | Tim Minear | September 27, 2002 | 1AGE02 |
| 4.0 | " Shindig " | Vern Gillum | Jane Espenson | November 1, 2002 | 1AGE03 |
| 5.0 | " Safe " | Michael Grossman | Drew Z. Greenberg | November 8, 2002 | 1AGE04 |
| 6.0 | " Our Mrs. Reynolds " | Vondie Curtis Hall | Joss Whedon | October 4, 2002 | 1AGE05 |
| 7.0 | " Jaynestown " | Marita Grabiak | Ben Edlund | October 18, 2002 | 1AGE06 |
| 8.0 | " Out of Gas " | David Solomon | Tim Minear | October 25, 2002 | 1AGE07 |
| 9.0 | " Ariel " | Allan Kroeker | Jose Molina | November 15, 2002 | 1AGE08 |
| 10.0 | " War Stories " | James Contner | Cheryl Cain | December 6, 2002 | 1AGE09 |
| 11.0 | " Trash " | Vern Gillum | Ben Edlund & Jose Molina | July 21, 2003 | 1AGE12 |
| 12.0 | " The Message " | Tim Minear | Joss Whedon & Tim Minear | July 28, 2003 | 1AGE13 |
| 13.0 | " Heart of Gold " | Thomas J. Wright | Brett Matthews | August 4, 2003 | 1AGE10 |
Question:
What is the production code for the episode written by Drew Z. Greenberg?
Answer:
1AGE04