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 | Air Date | Timeslot | Households (Rating/Share) | 18-49 (Rating/Share) | Viewers (m) | Weekly Rank (#) |
| --- | --- | --- | --- | --- | --- | --- |
| "Pilot" | February 4, 2008 | 8:30 P.M. | 5.1/8 | 2.7/7 | 8.14 | 35 |
| "Weekend at Saul's" | February 11, 2008 | 8:30 P.M. | 4.5/7 | 2.6/7 | 7.13 | 30 |
| "The Letter" | February 18, 2008 | 8:30 P.M. | 3.4/5 | 2.0/5 | 5.45 | 42 |
| "The Wrecking Crew" | February 25, 2008 | 8:30 P.M. | 3.1/5 | 1.8/5 | 5.34 | N/A |
| "Mr. Big Meeting" | March 3, 2008 | 8:30 P.M. | 3.6/5 | 1.8/5 | 5.63 | 59 |
Question:
Tell me the episode with an 18-49 rating of 2.0/5
Answer:
"The Letter"