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 |
| --- | --- | --- | --- | --- | --- | --- |
| 81.0 | 1.0 | "We'll Follow the Sun" | Gerry Cohen | Ron Leavitt & Michael G. Moye | September 23, 1990 | 5.01 |
| 82.0 | 2.0 | "Al... with Kelly" | Gerry Cohen | Stacie Lipp & Gabrielle Topping | September 30, 1990 | 5.02 |
| 83.0 | 3.0 | "Sue Casa, His Casa" | Gerry Cohen | Kevin Curran | October 7, 1990 | 5.03 |
| 84.0 | 4.0 | "The Unnatural" | Gerry Cohen | Katherine Green | October 14, 1990 | 5.04 |
| 85.0 | 5.0 | "The Dance Show" | Gerry Cohen | Arthur Silver | October 21, 1990 | 5.05 |
| 86.0 | 6.0 | "Kelly Bounces Back" | Gerry Cohen | Al Aidekman | October 28, 1990 | 5.06 |
| 87.0 | 7.0 | "Married... with Aliens" | Gerry Cohen | Ellen L. Fogle | November 4, 1990 | 5.07 |
| 88.0 | 8.0 | "Wabbit Season" | Gerry Cohen | Ron Leavitt & Michael G. Moye | November 11, 1990 | 5.08 |
| 89.0 | 9.0 | "Do Ya Think I'm Sexy" | Gerry Cohen | Kevin Curran | November 18, 1990 | 5.09 |
| 90.0 | 10.0 | "One Down, Two to Go" | Gerry Cohen | Ralph R. Farquhar | November 25, 1990 | 5.10 |
| 91.0 | 11.0 | "And Baby Makes Money" | Gerry Cohen | Art Everett | December 16, 1990 | 5.11 |
| 92.0 | 12.0 | "Married... with Who" | Gerry Cohen | Ellen L. Fogle | January 6, 1991 | 5.12 |
| 93.0 | 13.0 | "The Godfather" | Gerry Cohen | Ralph R. Farquhar | February 3, 1991 | 5.13 |
| 94.0 | 14.0 | "Look Who's Barking" | Gerry Cohen | Katherine Green | February 10, 1991 | 5.14 |
| 95.0 | 15.0 | "A Man's Castle" | Gerry Cohen | Stacie Lipp | February 17, 1991 | 5.15 |
| 96.0 | 16.0 | "All Night Security Dude" | Gerry Cohen | Glen Eichler & Peter Gaffney | February 24, 1991 | 5.16 |
| 97.0 | 17.0 | "Oldies But Young 'Uns" | Gerry Cohen | Bill Prady | March 17, 1991 | 5.17 |
| 98.0 | 18.0 | "Weenie Tot Lovers & Other Strangers" | Gerry Cohen | Kevin Curran | March 24, 1991 | 5.18 |
| 99.0 | 19.0 | "Kids! Wadaya Gonna Do?" | Linda Day | Ellen L. Fogle | April 7, 1991 | 5.19 |
| 100.0 | 20.0 | " Top of the Heap " | Gerry Cohen | Ron Leavitt & Arthur Silver | April 7, 1991 | 5.20 |
| 101.0 | 21.0 | "You Better Shop Around (Part 1)" | Linda Day | J.D. Brangato & Michael Ferris | April 14, 1991 | 5.21 |
| 102.0 | 22.0 | "You Better Shop Around (Part 2)" | Linda Day | Stacie Lipp | April 21, 1991 | 5.22 |
| 103.0 | 23.0 | "Route 666 (Part 1)" | Gerry Cohen | Katherine Green | April 28, 1991 | 5.23 |
| 104.0 | 24.0 | "Route 666 (Part 2)" | Gerry Cohen | Ralph R. Farquhar | May 5, 1991 | 5.24 |
Question:
What's the season number of the episode with series number 84?
Answer:
4.0