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 | Production code |
| --- | --- | --- | --- | --- | --- | --- |
| 75 | 1 | "Call of the Wild" | Jay Sandrich | Gary Kott | September 24, 1987 | 402.0 |
| 76 | 2 | "Theogate" | Jay Sandrich | John Markus | October 1, 1987 | 401.0 |
| 77 | 3 | "It Ain't Easy Being Green" | Carl Lauten & Regge Life | John Markus & Carmen Finestra | October 8, 1987 | 408.0 |
| 78 | 4 | "Cliff's Mistake" | Carl Lauten & Regge Life | Janet Leahy | October 15, 1987 | 405.0 |
| 79 | 5 | "Shakespeare" | Jay Sandrich | Matt Robinson | October 22, 1987 | 323.0 |
| 80 | 6 | "That's Not What I Said" | Jay Sandrich | Carmen Finestra | October 29, 1987 | 403.0 |
| 81 | 7 | "Autumn Gifts" | Carl Lauten & Regge Life | Matt Williams | November 5, 1987 | 404.0 |
| 82-83 | 8-9 | "Looking Back" | Jay Sandrich | John Markus & Carmen Finestra & Gary Kott | November 12, 1987 | 413.0 |
| 84 | 10 | "Where's Rudy?" | Tony Singletary | Gary Kott | November 19, 1987 | 409.0 |
| 85 | 11 | "Dance Mania" | Tony Singletary | Matt Williams | December 3, 1987 | 410.0 |
| 86 | 12 | "The Locker Room" | Jay Sandrich | Janet Leahy | December 10, 1987 | 406.0 |
| 87 | 13 | "The Show Must Go On" | Jay Sandrich | John Markus & Carmen Finestra & Gary Kott | December 17, 1987 | 414.0 |
| 88 | 14 | "Bookworm" | Jay Sandrich | Janet Leahy | January 7, 1988 | 411.0 |
| 90 | 16 | "The Visit" | Regge Life | John Markus & Carmen Finestra & Gary Kott | January 21, 1988 | 416.0 |
| 91 | 17 | "The Drum Major" | Regge Life | Matt Robinson | February 4, 1988 | 412.0 |
| 92 | 18 | "Waterworks" | Tony Singletary | Janet Leahy | February 11, 1988 | 417.0 |
| 93 | 19 | "Once Upon a Time" | Tony Singletary | John Markus & Carmen Finestra & Gary Kott | February 18, 1988 | 415.0 |
| 94 | 20 | "Petanque" | Regge Life | Matt Williams | February 25, 1988 | 418.0 |
| 95 | 21 | "Trust Me" | Jay Sandrich | John Markus & Carmen Finestra & Gary Kott | March 3, 1988 | 420.0 |
| 96 | 22 | "Home for the Weekend" | Tony Singletary | John Markus & Carmen Finestra & Gary Kott | March 17, 1988 | 421.0 |
| 97 | 23 | "The Prom" | Tony Singletary | Janet Leahy | March 24, 1988 | 422.0 |
Question:
What episoe number in the season originally aired on February 11, 1988?
Answer:
18.0