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:
| Boat # | Name | Builder | Laid down | Launched | Completed | Fate |
| --- | --- | --- | --- | --- | --- | --- |
| 4911 | Ha-201 | Sasebo Naval Arsenal | 01-03-1945 | 23-04-1945 | 31-05-1945 | Decommissioned 30-11-1945. Scuttled off Gotō Islands 01-04-1946. |
| 4912 | Ha-202 | Sasebo Naval Arsenal | 01-03-1945 | 23-04-1945 | 31-05-1945 | Decommissioned 30-11-1945. Scuttled off Gotō Islands 01-04-1946. |
| 4913 | Ha-203 | Sasebo Naval Arsenal | 05-04-1945 | 25-05-1945 | 26-06-1945 | Decommissioned 30-11-1945. Scuttled off Gotō Islands 01-04-1946. |
| 4914 | Ha-204 | Sasebo Naval Arsenal | 05-04-1945 | 01-06-1945 | 25-06-1945 | Decommissioned 30-11-1945. Grounded at Aburatsu Bay, October 1946. Salvaged and scrapped August 1948. |
| 4915 | Ha-205 | Sasebo Naval Arsenal | 17-04-1945 | 14-05-1945 | 03-07-1945 | Decommissioned 30-11-1945. Scuttled at Iyo Nada, May 1946. |
| 4916 | Ha-206 | Kawasaki-Senshū Shipyard | 19-03-1945 | 10-07-1945 |  | Incomplete until the end of war (95%), sunk by typhoon 25-08-1945. Salvaged and scuttled at Kii Channel 06-05-1946. |
| 4917 | Ha-207 | Sasebo Naval Arsenal | 23-04-1945 | 26-05-1945 | 14-08-1945 | Decommissioned 30-11-1945. Scuttled off Sasebo 05-04-1946. |
| 4918 | Ha-208 | Sasebo Naval Arsenal | 01-05-1945 | 26-05-1945 | 04-08-1945 | Decommissioned 30-11-1945. Scuttled off Gotō Islands 01-04-1946. |
| 4919 | Ha-209 | Sasebo Naval Arsenal | 07-05-1945 | 31-05-1945 | 04-08-1945 | Decommissioned 30-11-1945. Scrapped August 1946. |
| 4920 | Ha-210 | Sasebo Naval Arsenal | 14-05-1945 | 10-06-1945 | 11-08-1945 | Decommissioned 30-11-1945. Scuttled off Sasebo 05-04-1946. |
| 4921 | Ha-211 | Kawasaki-Senshū Shipyard | 01-04-1945 | April 1946 |  | Incomplete until the end of war (40%). Scuttled at Kii Channel 06-05-1946. |
| 4922 | Ha-212 | Kawasaki-Kōbe Shipyard | 10-04-1945 | 25-06-1945 |  | Incomplete until the end of war (95%). Scuttled at Kii Channel, May 1946. |
| 4923 | Ha-213 | Mitsubishi-Kōbe Shipyard | 15-05-1945 | 29-07-1945 |  | Incomplete until the end of war (93%). Scuttled at Kii Channel 06-05-1946. |
| 4924 | Ha-214 | Mitsubishi-Kōbe Shipyard | 15-05-1945 | 15-08-1945 |  | Incomplete until the end of war (75%). Scuttled at Kii Channel 06-05-1946. |
| 4925 | Ha-215 | Sasebo Naval Arsenal | 22-05-1945 | 15-05-1945 |  | Incomplete until the end of war (95%). Scuttled off Sasebo 05-04-1946. |
| 4926 | Ha-216 | Sasebo Naval Arsenal | 27-05-1945 | 19-06-1945 | 16-08-1945 | Decommissioned 30-11-1945. Scuttled off Sasebo 05-04-1946. |
| 4927 | Ha-217 | Sasebo Naval Arsenal | 02-06-1945 | 26-06-1945 |  | Incomplete until the end of war (90%). Scuttled off Sasebo 05-04-1946. |
| 4928 | Ha-218 | Sasebo Naval Arsenal | 08-06-1945 | 02-07-1945 |  | Incomplete until the end of war (90%). Scrapped, December 1946. |
| 4929 | Ha-219 | Sasebo Naval Arsenal | 15-06-1945 | 12-07-1945 |  | Incomplete until the end of war (90%). Scuttled off Sasebo 05-04-1946. |
| 4930 | Ha-220 | Kawasaki-Senshū Shipyard | 10-05-1945 |  |  | Incomplete until the end of war (20%). Scrapped, June 1946. |
| 4931 | Ha-221 | Mitsubishi-Kōbe Shipyard | 20-04-1945 | 04-08-1945 |  | Incomplete until the end of war (85%). Scuttled at Kii Channel, 06-05-1946. |
| 4932 | Ha-222 | Kawasaki-Senshū Shipyard | 15-05-1945 |  |  | Incomplete until the end of war (15%). Scrapped, June 1946. |
| 4933 | Ha-223 | Kawasaki-Kōbe Shipyard | 01-05-1945 |  |  | Incomplete until the end of war (60%). Scrapped, June 1946. |
| 4934 | Ha-224 | Mitsubishi-Kōbe Shipyard | 07-06-1945 |  |  | Incomplete until the end of war (55%). Scrapped, June 1946. |
| 4935 | Ha-225 | Mitsubishi-Kōbe Shipyard | 07-06-1945 |  |  | Incomplete until the end of war (45%). Scrapped, June 1946. |
| 4936 | Ha-226 | Mitsubishi-Kōbe Shipyard | 16-06-1945 |  |  | Incomplete until the end of war (35%). Scrapped, June 1946. |
| 4937 | Ha-227 | Mitsubishi-Kōbe Shipyard | 10-07-1945 |  |  | Incomplete until the end of war (25%). Scrapped, June 1946. |
| 4938 | Ha-228 | Sasebo Naval Arsenal | 21-06-1945 | 18-07-1945 |  | Incomplete until the end of war (75%). Scuttled off Sasebo 05-04-1946. |
| 4939 | Ha-229 | Sasebo Naval Arsenal | 27-06-1945 | 27-07-1945 |  | Incomplete until the end of war (75%). Scrapped, December 1946. |
| 4940 | Ha-230 | Sasebo Naval Arsenal | 03-07-1945 |  |  | Incomplete until the end of war (60%). Scrapped, December 1946. |
| 4941 | Ha-231 | Sasebo Naval Arsenal | 12-07-1945 |  |  | Incomplete until the end of war (50%). Later scrapped. |
| 4942 | Ha-232 | Sasebo Naval Arsenal | 18-07-1945 |  |  | Incomplete until the end of war (40%). Later scrapped. |
| 4943 | Ha-233 | Kawasaki-Senshū Shipyard | 01-06-1945 |  |  | Incomplete until the end of war (10%). Later scrapped. |
| 4944 | Ha-234 | Kawasaki-Kōbe Shipyard | 15-05-1945 |  |  | Incomplete until the end of war (50%). Scrapped, June 1946. |
| 4945 | Ha-235 | Kawasaki-Senshū Shipyard | 01-06-1945 |  |  | Incomplete until the end of war (10%). Later scrapped. |
| 4946 | Ha-236 | Kawasaki-Kōbe Shipyard | 01-06-1945 |  |  | Incomplete until the end of war (40%). Scrapped, June 1946. |
| 4947 | Ha-237 | Mitsubishi-Kōbe Shipyard | 10-07-1945 |  |  | Incomplete until the end of war (25%). Scrapped, June 1946. |
| 4948 | Ha-238 | Mitsubishi-Kōbe Shipyard | 01-08-1945 |  |  | Incomplete until the end of war (15%). Scrapped, June 1946. |
| 4949 | Ha-239 | Mitsubishi-Kōbe Shipyard | 01-08-1945 |  |  | Incomplete until the end of war. Scrapped, June 1946. |
| 4950 | Ha-240 | Mitsubishi-Kōbe Shipyard | 01-08-1945 |  |  | Incomplete until the end of war. Scrapped, June 1946. |
| 4951 - 4955 |  |  |  |  |  | Constructions were not started until the end of war. |
| 4956 | Ha-246 | Kawasaki-Senshū Shipyard | 13-07-1945 |  |  | Incomplete until the end of war (5%). Later scrapped. |
| 4957 | Ha-247 | Kawasaki-Kōbe Shipyard | 26-06-1945 |  |  | Incomplete until the end of war. Later scrapped. |
| 4958 - 4989 |  |  |  |  |  | Constructions were not started until the end of war. |
Question:
when was a boat launched immediately before ha-206?
Answer:
Ha-218