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:
| Date | Cover model | Centerfold model | Interview subject | 20 Questions |
| --- | --- | --- | --- | --- |
| 1-88 | none | Kimberley Conrad | Arnold Schwarzenegger | Susan Dey |
| 2-88 | Sandy Greenberg | Kari Kennell | Oliver Stone | Harold Washington |
| 3-88 | Terri Lynn Doss | Susie Owens | Billy Crystal | Tom Waits |
| 4-88 | Vanity | Eloise Broady | Tom Clancy | Harrison Ford |
| 5-88 | Laurie Carr | Diana Lee | Don King | Teri Garr |
| 6-88 | India Allen | Emily Arth | Chevy Chase | Theresa Russell |
| 7-88 | Cindy Crawford | Terri Lynn Doss | Paul Hogan | Judge Reinhold |
| 8-88 | Kimberley Conrad | Helle Michaelsen | Harry Edwards | Harvey Fierstein |
| 9-88 | Jessica Hahn | Laura Richmond | Yasser Arafat | Tracey Ullman |
| 10-88 | Terri Lynn Doss | Shannon Long | Roger Craig | Morton Downey Jr. |
| 11-88 | Laura Richmond | Pia Reyes | Bruce Willis | John Cleese |
| 12-88 | Kata Kärkkäinen | Kata Kärkkäinen | Cher | Gene Simmons |
Question:
When was Shannon Long the Centerfold model?
Answer:
10-88