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:
| No. in series | No. in season | Title | Directed by | Written by | Original air date |
| --- | --- | --- | --- | --- | --- |
| 23.0 | 1.0 | "We the People" | Les Landau | Donald P. Bellisario | January 3, 1997 |
| 24.0 | 2.0 | "Secrets" | Ray Austin | Tom Towler | January 10, 1997 |
| 25.0 | 3.0 | "Jinx" | Jerry Jameson | Jack Orman | January 17, 1997 |
| 26.0 | 4.0 | "Heroes" | Tony Wharmby | R. Scott Gemmill | January 24, 1997 |
| 27.0 | 5.0 | "Crossing the Line" | Tony Wharmby | Stephen Zito | January 31, 1997 |
| 28.0 | 6.0 | "Trinity" | Alan J. Levi | Jack Orman | February 7, 1997 |
| 29.0 | 7.0 | "Ghosts" | Ray Austin | R. Scott Gemmill | February 7, 1997 |
| 30.0 | 8.0 | "Full Engagement" | Alan J. Levi | Jack Orman | February 21, 1997 |
| 31.0 | 9.0 | "Washington Holiday" | Joe Napolitano | Stephen Zito | February 28, 1997 |
| 32.0 | 10.0 | "The Game of Go" | Ray Austin | Tom Towler | February 28, 1997 |
| 33.0 | 11.0 | "Force Recon" | Alan J. Levi | Tom Towler & Stephen Zito | March 7, 1997 |
| 34.0 | 12.0 | "The Guardian" | Michael Schultz | Jack Orman | March 28, 1997 |
| 35.0 | 13.0 | "Code Blue" | Tony Wharmby | R. Scott Gemmill | April 4, 1997 |
| 36.0 | 14.0 | "Cowboys & Cossacks" | Tony Wharmby | R. Scott Gemmill | April 11, 1997 |
Question:
what is the name of the episode whose number of the series episode was 31?
Answer:
"Washington Holiday"