Tags: pwntools
Rating: 5.0
# AstroBot
## The task
`ID: astrobot (474 points) [PPC]`
AstroBot
We have found that HARPA is using a game for employee recruitment. It is based on the old AstroBlast [https://youtu.be/rn3RPIIC9gM?t=26](https://youtu.be/rn3RPIIC9gM?t=26).
Your mission is to automate a solution (bot) to dodge obstacles and capture asteroids (represented by asterisks). Hold on for **137 seconds** and you're hired!
Instructions:
* Use the arrow keys to change the spaceship direction.
* Use the spacebar to reverse the spaceship direction.
* Press "q" to exit at any moment.
* When the game is over, you can close the game with "q" or "spacebar".
* The screen shows the spaceship position and the number of captured asteroids.
For latency reasons, we recommend you to use a box on DigitalOcean:
**Servers:**
_**New York 3:**_
ssh [email protected] -p2222
eik7avou3yoo9Ohtai4a
_**Amsterdam 3:**_
ssh [email protected] -p2222
eik7avou3yoo9Ohtai4a
## Related news
2019-11-08 22:45:38 | all | AstroBot is being fixed, wait pls
2019-11-08 23:04:12 | all | AstroBot (NY3) should be ok now guys. We are working on AMS3
2019-11-08 23:13:05 | all | AstroBot (AMS3) should be working now as well
2019-11-08 23:18:06 | all | AstroBot (AMS3) new IP is 178.128.245.211. We will update the description too!
2019-11-09 13:22:08 | all | [AstroBot] Alternative IP with better latency for brazilians teams: 200.136.213.39
## The server code
The server's source was published: https://github.com/epicleet/astrobot-game
## The solution
Observations:
* Obstacles and asterisks are at the same positions every time. There are cosmetic changes only.
* Reported time is inaccurate and unstable.
* Due to network delays, commands should be sent beforehand.
* The spaceship's position and overall progress in game may be used to send commands reliably. The position plus number of collected asterisks was convenient to use together with pseudo command to skip sending.
* Choosing other server with lower ping, the script became very repeatable.
* Sometimes commands should be sent between screens, not right after screen. Hence the command that sleeps 10 ms before sending actual command. The third asterisk required this trick: the spaceship was one cell off to left or to right from the asterisk.
* It is possible to use pwntools: `p = process("TERM=xterm ssh ...", shell = True, stdin = PTY)`. Maybe `TERM=xterm` is not the best choice. `TERM=xterm screen ssh ...` was used by mistake, but it provided pretty output with pseudographics.
* Left arrow is `\033OD` and right arrow is `\033OC`, not `\033[D` and `\033[C`. (`ncu.py` is a script to print keys seen under curses. It was copy-pasted from SGLE during the CTF.)
* There is a loop in the map: everything repeats after 6 asterisks. So it is possible to repeat commands and collect all other asterisks easily.
In general, the game is similar to [SGLE](https://github.com/pauloklaus/sgle-game) from Pwn2Win 2018: player needs to dodge obstacles with fixed pattern. But player needs to collect asterisks, it needs additional precision. With SGLE, precision and repeatability was a problem. So this time, it was obvious that it cannot be won without higher precision. So different approaches and servers were tried, and the script became (almost) 100% reliable after all.
Testing reliability, commands to collect two asterisks were written. After that, the third asterisk required a delay. Ok, it was interesting. Then there were two options: either write logic to find path automatically, or continue writing commands manually. There was a hope that there was a loop, because obstacles have patterns so it was unlikely that there were no loop. So manual approach was continued. And after 6 asterisks, the pattern repeated.
It was hard to meet the initial point, so 7th asterisk was chosen as the point to loop commands. After a bit more work to catch the 7th asterisk, all commands were obtained. They were copy-pasted and numbers of asterisks were adjusted `+6`. And it just worked. So commands to collect 100+ asterisks were populated and they worked too. This part was easy and very satisfying!
The flag: `CTF-BR{HARPA's_PPCs_4r3_cr4zy}`
## Files in repo
* `ab.py` is the player, sender of commands.
* `print_log.py` is printer for `ab.log` based on pyte library.
* `print_map.py` is like `print_log.py` but prints only the bottom line of screen to visualize trace (it was written after the CTF).
* `ab.log` is the full raw output from server for the winning run, so the full output may be produced.
* `output.txt` is the output from the scripts during the winning run, there are not all screens due to `tail`, but the output below should be enough.
* `ncu.py` is the script to test input under curses, derived from SGLE.
## The map
The screen with the first wave of obstacles:
```
┌[13:2]───[0.81/0]─────────────────────┐
│ W │
│ │
│ │
│ T U │
│ │
│ │
│ W T │
│ │
│ │
│U W U U│
│ │
│ │
│ V │
└──────────────────────────────────────┘
```
Pretty map of the loop without gaps:
```
...
│ │
│ U T │
│ W U │
│ W W │
│ W │
│ │
│ U * │
│ U U │
│ T W │
│ U │
│ │
│ T U │
│ U T │
│ W U │
│ U │
│ │
│ U T │
│ U T │
│ W U │
│ T │
│ │
...
│ │
│T U│
│ T U W W │
│U U T W│
│ T T │
│W * W│
│ T W │
│W U T W│
│ T W T U │
│W T│
│ │
...
│ │
│ T U T W T │
│ │
│ W │
│ │
│ T │
│ │
│ W U W U │
│ │
│ W U │
│ │
│ T T T │
│ │
│ * U T T │
│ │
│ T U T T │
│ │
│ U T W │
│ │
│ W T │
│ │
│ W T W U │
│ │
│ W │
│ │
│ U │
│ │
│ T T U W │
│ │
...
│ │
│ U │
│ │
│ U │
│ │
│ * │
│ │
│ U │
│ │
│ W │
│ │
│ T W │
│ │
│ T T │
│ │
│ W T │
│ │
│ W U │
│ │
│ T │
│ │
│ W │
│ │
│ W │
│ │
│ * │
│ │
│ W │
│ │
...
│ │
│ W │
│ │
│ │
│ T W │
│ │
│ │
│ T W │
│ │
│ │
│U U * W T│
│ │
│ │
│ T W │
│ │
│ │
│ T U │
│ │
│ │
│ T │
│ │
│ │
...
│ │
│ W │
│ │
│ │
│ T U │
│ │
│ │
│ W T │
│ │
│ │
│U W U U│
│ │
...
```
## The log
The log below is built from the last line of every screen (using `print_map.py` with manual adjustments). There are duplicate screens with the same title. Also obstacles repeat on 2 lines because the ship is faster. Also the log is upside down, so it does not look pretty.
The log was for the game with ~45.7 ms ping. The delays between sending a command and respective changes of direction are pretty visible.
The beginning before the first asterisk:
```
[13:19]──[0.00/0] │ V │
[13:18]──[0.02/0] │ V │
[13:17]──[0.04/0] │ V │
[13:16]──[0.06/0] │ V │
[13:15]──[0.08/0] │ V │
[13:14]──[0.10/0] │ V │
[13:13]──[0.12/0] │ V │
[13:12]──[0.14/0] │ V │
[13:11]──[0.16/0] │ V │
[13:10]──[0.19/0] │ V │
[13:9]───[0.21/0] │ V │
[13:8]───[0.23/0] │ V │ 8/0 i
[13:7]───[0.25/0] │ V │
[13:6]───[0.27/0] │ V │
[13:5]───[0.29/0] │ V │
[13:4]───[0.31/0] │ V │
[13:3]───[0.33/0] │ V │
[13:2]───[0.35/0] │ V │
[13:1]───[0.37/0] │V │
[13:1]───[0.39/0] │V │
[13:2]───[0.41/0] │ V │
[13:3]───[0.43/0] │ V │
[13:4]───[0.45/0] │ V │
[13:5]───[0.47/0] │ V │
[13:6]───[0.49/0] │ V │
[13:7]───[0.51/0] │ V │
[13:8]───[0.53/0] │ V │ 8/0 <
[13:9]───[0.55/0] │ V │
[13:10]──[0.57/0] │ V │
[13:10]──[0.58/0] │ V │
[13:9]───[0.60/0] │ V │
[13:8]───[0.62/0] │ V │
[13:7]───[0.64/0] │ V │
[13:6]───[0.66/0] │ V │
[13:5]───[0.68/0] │ V │
[13:4]───[0.70/0] │ V │
[13:3]───[0.72/0] │ V │
[13:2]───[0.74/0] │ V │
[13:1]───[0.76/0] │V │
[13:1]───[0.78/0] │V │
[13:2]───[0.81/0] │ V │
[13:3]───[0.83/0] │ V │
[13:4]───[0.85/0] │ V │
[13:5]───[0.87/0] │ V │
[13:6]───[0.89/0] │ V │
[13:7]───[0.91/0] │U W V U U│
[13:8]───[0.93/0] │U W V U U│
[13:9]───[0.95/0] │ V │
[13:10]──[0.97/0] │ V │
[13:11]──[0.99/0] │ V │
[13:12]──[1.01/0] │ V │
[13:13]──[1.03/0] │ W V T │
[13:14]──[1.05/0] │ W V T │ 14/0 i
[13:15]──[1.07/0] │ V │
[13:16]──[1.09/0] │ V │
[13:17]──[1.11/0] │ V │
[13:18]──[1.13/0] │ V │
[13:19]──[1.15/0] │ T V U │
[13:20]──[1.17/0] │ T V U │
[13:21]──[1.19/0] │ V │
[13:22]──[1.22/0] │ V │
[13:23]──[1.24/0] │ V │
[13:24]──[1.26/0] │ V │
[13:25]──[1.28/0] │ W V │
[13:26]──[1.30/0] │ W V │
[13:27]──[1.32/0] │ V │
[13:28]──[1.34/0] │ V │
[13:29]──[1.36/0] │ V │
[13:30]──[1.38/0] │ V │
[13:31]──[1.40/0] │ V │
[13:32]──[1.42/0] │ V │
[13:33]──[1.44/0] │ V │
[13:34]──[1.46/0] │ V │
[13:35]──[1.48/0] │ V │
[13:36]──[1.50/0] │ V │
[13:37]──[1.52/0] │ V │
[13:38]──[1.54/0] │ V│
[13:38]──[1.56/0] │ V│
[13:37]──[1.58/0] │ V │
[13:36]──[1.60/0] │ V │
[13:35]──[1.63/0] │ V │
[13:34]──[1.65/0] │ V │
[13:33]──[1.67/0] │ V │
[13:32]──[1.69/0] │ V │
[13:31]──[1.71/0] │ V │
[13:30]──[1.73/0] │ V │
[13:29]──[1.75/0] │ V │
[13:28]──[1.77/0] │ V │
[13:27]──[1.79/0] │ V │
[13:26]──[1.81/0] │ V │
[13:25]──[1.83/0] │ V │
[13:24]──[1.85/0] │ V │
[13:23]──[1.87/0] │ T V │
[13:22]──[1.89/0] │ T V │
[13:21]──[1.91/0] │ V │
[13:20]──[1.93/0] │ V │
[13:19]──[1.95/0] │ V │
[13:18]──[1.97/0] │ V │
[13:17]──[1.99/0] │ T V U │
[13:16]──[2.01/0] │ T V U │
[13:15]──[2.04/0] │ V │
[13:14]──[2.06/0] │ V │ 14/0 >
[13:13]──[2.08/0] │ V │
[13:12]──[2.10/0] │ V │ (**)
[13:12]──[2.10/0] │ V │ (**)
[13:13]──[2.12/0] │ T V W │
[13:14]──[2.14/0] │ T V W │
[13:15]──[2.17/0] │ V │
[13:16]──[2.19/0] │ V │
[13:17]──[2.21/0] │ V │
[13:18]──[2.23/0] │ V │
[13:19]──[2.25/0] │U U * W T│
```
`(**)` above: we got two screens with the same title.
The loop for asterisks 1-7, plus line before and after:
```
[13:18]──[2.23/0] │ V │
[13:19]──[2.25/0] │U U * W T│
[13:20]──[2.27/1] │U U V W T│
[13:21]──[2.29/1] │ V │
[13:22]──[2.31/1] │ V │
[13:23]──[2.33/1] │ V │
[13:24]──[2.35/1] │ V │
[13:25]──[2.37/1] │ T V W │
[13:26]──[2.39/1] │ T V W │
[13:27]──[2.41/1] │ V │
[13:28]──[2.43/1] │ V │
[13:29]──[2.45/1] │ V │
[13:30]──[2.47/1] │ V │
[13:31]──[2.49/1] │ T W V │
[13:32]──[2.51/1] │ T W V │
[13:33]──[2.54/1] │ V │
[13:34]──[2.56/1] │ V │
[13:35]──[2.58/1] │ V │
[13:36]──[2.60/1] │ V │
[13:37]──[2.62/1] │ W V │
[13:38]──[2.64/1] │ W V│
[13:38]──[2.66/1] │ V│
[13:37]──[2.68/1] │ V │
[13:36]──[2.70/1] │ V │
[13:35]──[2.72/1] │ V │
[13:34]──[2.74/1] │ V │
[13:33]──[2.76/1] │ V │
[13:32]──[2.78/1] │ V │
[13:31]──[2.80/1] │ V │
[13:30]──[2.82/1] │ V │
[13:29]──[2.85/1] │ V │
[13:28]──[2.87/1] │ V │
[13:27]──[2.89/1] │ V │
[13:26]──[2.91/1] │ V │
[13:25]──[2.93/1] │ V │
[13:24]──[2.95/1] │ V │
[13:23]──[2.97/1] │ V │
[13:22]──[2.99/1] │ V │
[13:21]──[3.01/1] │ V │
[13:20]──[3.03/1] │ V │
[13:19]──[3.05/1] │ V │ 19/1 >
[13:18]──[3.07/1] │ V │
[13:17]──[3.09/1] │ V │
[13:17]──[3.10/1] │ V │
[13:18]──[3.12/1] │ V │
[13:19]──[3.14/1] │ V │
[13:20]──[3.16/1] │ V │
[13:21]──[3.18/1] │ V │
[13:22]──[3.20/1] │ V │
[13:23]──[3.22/1] │ V W │
[13:24]──[3.24/1] │ V W │
[13:25]──[3.26/1] │ V │
[13:26]──[3.28/1] │ V │
[13:27]──[3.30/1] │ * │
[13:28]──[3.32/2] │ V │
[13:29]──[3.34/2] │ V │
[13:30]──[3.36/2] │ V │
[13:31]──[3.38/2] │ W V │
[13:32]──[3.40/2] │ W V │
[13:33]──[3.42/2] │ V │
[13:34]──[3.44/2] │ V │
[13:35]──[3.47/2] │ W V │
[13:36]──[3.49/2] │ W V │
[13:37]──[3.51/2] │ V │
[13:38]──[3.53/2] │ V│ 38/2 >
[13:38]──[3.55/2] │ T V│
[13:37]──[3.57/2] │ T V │
[13:37]──[3.57/2] │ T V │
[13:38]──[3.59/2] │ V│
[13:38]──[3.61/2] │ V│
[13:37]──[3.63/2] │ W U V │
[13:36]──[3.66/2] │ W U V │
[13:35]──[3.68/2] │ V │
[13:34]──[3.70/2] │ V │
[13:33]──[3.72/2] │ W T V │
[13:32]──[3.74/2] │ W T V │
[13:31]──[3.76/2] │ V │
[13:30]──[3.78/2] │ V │
[13:29]──[3.80/2] │ T VT │
[13:28]──[3.82/2] │ T V T │
[13:27]──[3.84/2] │ V │
[13:26]──[3.86/2] │ V │
[13:25]──[3.88/2] │ T V W │
[13:24]──[3.90/2] │ T V W │
[13:23]──[3.92/2] │ V │
[13:22]──[3.94/2] │ V │
[13:21]──[3.96/2] │ V W │
[13:20]──[3.98/2] │ V W │
[13:19]──[4.00/2] │ V │
[13:18]──[4.03/2] │ V │ 18/2 s>
[13:17]──[4.05/2] │ V U │
[13:16]──[4.07/2] │ V U │
[13:16]──[4.08/2] │ V │
[13:17]──[4.10/2] │ V │
[13:18]──[4.12/2] │ * │
[13:19]──[4.14/3] │ V │
[13:20]──[4.16/3] │ V │
[13:21]──[4.18/3] │ V │
[13:22]──[4.20/3] │ U V │
[13:23]──[4.22/3] │ U V │
[13:24]──[4.25/3] │ V │
[13:25]──[4.27/3] │ V │
[13:26]──[4.29/3] │ U V │
[13:27]──[4.31/3] │ U V │
[13:28]──[4.33/3] │ V │
[13:29]──[4.35/3] │ V │
[13:30]──[4.37/3] │ V │
[13:31]──[4.39/3] │ V │
[13:32]──[4.41/3] │ V │
[13:33]──[4.43/3] │ V │
[13:34]──[4.45/3] │ V │
[13:35]──[4.47/3] │ V │
[13:36]──[4.49/3] │ V │
[13:37]──[4.51/3] │ V │
[13:38]──[4.53/3] │ V│
[13:38]──[4.55/3] │ V│
[13:37]──[4.57/3] │ V │
[13:36]──[4.60/3] │ V │
[13:35]──[4.62/3] │ V │
[13:34]──[4.64/3] │ V │
[13:33]──[4.66/3] │ V │
[13:32]──[4.68/3] │ V │
[13:31]──[4.70/3] │ V │
[13:30]──[4.72/3] │ V │
[13:29]──[4.74/3] │ V │
[13:28]──[4.76/3] │ V │
[13:27]──[4.78/3] │ V │
[13:26]──[4.80/3] │ V │
[13:25]──[4.82/3] │ V │
[13:24]──[4.84/3] │ V │
[13:23]──[4.86/3] │ V │
[13:22]──[4.88/3] │ T T U W V │
[13:21]──[4.91/3] │ T T U W V │
[13:20]──[4.93/3] │ V │
[13:19]──[4.95/3] │ V │
[13:18]──[4.97/3] │ U V │
[13:17]──[4.99/3] │ U V │
[13:16]──[5.01/3] │ V │
[13:15]──[5.03/3] │ V │
[13:14]──[5.05/3] │ W V │
[13:13]──[5.07/3] │ W V │
[13:12]──[5.09/3] │ V │
[13:11]──[5.11/3] │ V │
[13:10]──[5.13/3] │ W V T W U │
[13:9]───[5.15/3] │ W V T W U │
[13:8]───[5.18/3] │ V │ 8/3 >
[13:7]───[5.20/3] │ V │
[13:6]───[5.22/3] │ W V T │
[13:6]───[5.22/3] │ W V T │
[13:7]───[5.24/3] │ W V T │
[13:8]───[5.26/3] │ V │
[13:9]───[5.28/3] │ V │
[13:10]──[5.30/3] │ V U T W │
[13:11]──[5.33/3] │ VU T W │
[13:12]──[5.35/3] │ V │
[13:13]──[5.37/3] │ V │ 13/3 <
[13:14]──[5.39/3] │ T V U T T │
[13:15]──[5.41/3] │ T V U T T │
[13:15]──[5.41/3] │ T V U T T │
[13:14]──[5.43/3] │ V │
[13:13]──[5.45/3] │ V │
[13:12]──[5.47/3] │ * U T T │
[13:11]──[5.50/4] │ V U T T │
[13:10]──[5.52/4] │ V │
[13:9]───[5.54/4] │ V │
[13:8]───[5.56/4] │ V T T T │
[13:7]───[5.58/4] │ V T T T │
[13:6]───[5.60/4] │ V │
[13:5]───[5.62/4] │ V │
[13:4]───[5.64/4] │ V W U │ 4/4 >
[13:3]───[5.66/4] │ V W U │
[13:2]───[5.68/4] │ V │
[13:2]───[5.69/4] │ V │
[13:3]───[5.71/4] │ V │
[13:4]───[5.73/4] │ V W U W U │
[13:5]───[5.75/4] │ V W U W U │
[13:6]───[5.77/4] │ V │
[13:7]───[5.79/4] │ V │
[13:8]───[5.81/4] │ V T │
[13:9]───[5.83/4] │ V T │
[13:10]──[5.85/4] │ V │
[13:11]──[5.88/4] │ V │
[13:12]──[5.90/4] │ V W │
[13:13]──[5.92/4] │ V W │
[13:14]──[5.94/4] │ V │
[13:15]──[5.96/4] │ V │
[13:16]──[5.98/4] │ V T U T W T │
[13:17]──[6.00/4] │ V T U T W T │
[13:18]──[6.02/4] │ V │
[13:19]──[6.04/4] │ V │
[13:20]──[6.06/4] │ V │
[13:21]──[6.08/4] │ V │
[13:22]──[6.10/4] │ V │
[13:23]──[6.12/4] │ V │
[13:24]──[6.14/4] │ V │
[13:25]──[6.17/4] │ V │
[13:26]──[6.19/4] │ V │
[13:27]──[6.21/4] │ V │
[13:28]──[6.23/4] │ V │
[13:29]──[6.25/4] │ V │
[13:30]──[6.27/4] │ V │
[13:31]──[6.29/4] │ V │
[13:32]──[6.31/4] │ V │
[13:33]──[6.33/4] │ V │
[13:34]──[6.35/4] │ V │ 34/4 <
[13:35]──[6.37/4] │ V │
[13:36]──[6.40/4] │ V │
[13:36]──[6.40/4] │ V │
[13:35]──[6.42/4] │ V │
[13:34]──[6.44/4] │ V │
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[13:30]──[6.52/4] │ V │
[13:29]──[6.54/4] │ V │
[13:28]──[6.56/4] │ V │
[13:27]──[6.59/4] │W V T│
[13:26]──[6.61/4] │W V T│
[13:25]──[6.63/4] │ T W V T U │
[13:24]──[6.65/4] │ T W V T U │
[13:23]──[6.67/4] │W U V T W│
[13:22]──[6.69/4] │W U V T W│
[13:21]──[6.71/4] │ T VW │
[13:20]──[6.73/4] │ T V W │
[13:19]──[6.75/4] │W * W│ 19/4 >
[13:18]──[6.77/5] │W V W│
[13:17]──[6.79/5] │ TV T │
[13:17]──[6.80/5] │ TV T │
[13:18]──[6.82/5] │ T V T │
[13:19]──[6.84/5] │U U V T W│
[13:20]──[6.86/5] │U U V T W│
[13:21]──[6.88/5] │ T U V W W │
[13:22]──[6.90/5] │ T U V W W │
[13:23]──[6.92/5] │T V U│
[13:24]──[6.95/5] │T V U│
[13:25]──[6.97/5] │ V │
[13:26]──[6.99/5] │ V │
[13:27]──[7.01/5] │ V │
[13:28]──[7.03/5] │ V │
[13:29]──[7.05/5] │ V │
[13:30]──[7.07/5] │ V │
[13:31]──[7.09/5] │ V │ 31/5 i
[13:32]──[7.11/5] │ V │
[13:33]──[7.13/5] │ V │
[13:34]──[7.15/5] │ V │
[13:35]──[7.17/5] │ V │
[13:36]──[7.19/5] │ V │
[13:37]──[7.21/5] │ V │
[13:38]──[7.23/5] │ V│
[13:38]──[7.26/5] │ V│
[13:37]──[7.28/5] │ V │
[13:36]──[7.30/5] │ V │
[13:35]──[7.32/5] │ V │
[13:34]──[7.34/5] │ V │
[13:33]──[7.36/5] │ V │
[13:32]──[7.38/5] │ V │
[13:31]──[7.40/5] │ V │ 31/5 s>
[13:30]──[7.42/5] │ V │
[13:29]──[7.44/5] │ V │
[13:29]──[7.46/5] │ V │
[13:30]──[7.48/5] │ V │
[13:31]──[7.50/5] │ V │
[13:32]──[7.52/5] │ T V │
[13:33]──[7.54/5] │ T V │
[13:34]──[7.56/5] │ W U V │
[13:35]──[7.58/5] │ W U V │
[13:36]──[7.60/5] │ U T V │
[13:37]──[7.62/5] │ U T V │
[13:38]──[7.64/5] │ U T V│
[13:38]──[7.67/5] │ U T V│
[13:37]──[7.69/5] │ V │
[13:36]──[7.71/5] │ V │
[13:35]──[7.73/5] │ U V │
[13:34]──[7.75/5] │ U V │
[13:33]──[7.77/5] │ W U V │
[13:32]──[7.79/5] │ W U V │
[13:31]──[7.81/5] │ U T V │
[13:30]──[7.83/5] │ U TV │
[13:29]──[7.85/5] │ T V U │
[13:28]──[7.87/5] │ T V U │
[13:27]──[7.89/5] │ V │
[13:26]──[7.91/5] │ V │
[13:25]──[7.94/5] │ U V │
[13:24]──[7.96/5] │ U V │
[13:23]──[7.98/5] │ T W V │
[13:22]──[8.00/5] │ T W V │
[13:21]──[8.02/5] │ U U V │
[13:20]──[8.04/5] │ U U V │
[13:19]──[8.06/5] │ U * │
[13:18]──[8.08/6] │ U V │
[13:17]──[8.10/6] │ V │
[13:16]──[8.12/6] │ V │
[13:15]──[8.14/6] │ V W │
[13:14]──[8.16/6] │ V W │
[13:13]──[8.18/6] │ V W W │
[13:12]──[8.20/6] │ V W W │
[13:11]──[8.22/6] │ V W U │
[13:10]──[8.24/6] │ V W U │
[13:9]───[8.26/6] │ V U T │
[13:8]───[8.28/6] │ V U T │
[13:7]───[8.30/6] │ V │
[13:6]───[8.32/6] │ V │
[13:5]───[8.35/6] │ V │
[13:4]───[8.37/6] │ V │
[13:3]───[8.39/6] │ V │
[13:2]───[8.41/6] │ V │ 2/6 <
[13:1]───[8.43/6] │V │
[13:1]───[8.45/6] │V │
[13:1]───[8.45/6] │V │
[13:1]───[8.47/6] │V │
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[13:3]───[8.51/6] │ V │
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[13:6]───[8.58/6] │ V │
[13:7]───[8.60/6] │ V │
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[13:18]──[8.82/6] │ V │
[13:19]──[8.84/6] │ V │
[13:20]──[8.86/6] │ V │ 20/6 <
[13:21]──[8.88/6] │ V │
[13:22]──[8.91/6] │ V │
[13:22]──[8.91/6] │ V │
[13:21]──[8.93/6] │ V │
[13:20]──[8.95/6] │ V │ 20/6 i
[13:19]──[8.97/6] │ V │
[13:18]──[8.99/6] │ V │
[13:17]──[9.02/6] │ V │
[13:16]──[9.04/6] │ V │
[13:15]──[9.06/6] │ V │
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[13:13]──[9.10/6] │ V │
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[13:11]──[9.14/6] │ V │
[13:10]──[9.16/6] │ V │
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[13:7]───[9.22/6] │ V │
[13:6]───[9.24/6] │U W V U U│
[13:5]───[9.26/6] │U WV U U│
[13:4]───[9.28/6] │ V │
[13:3]───[9.31/6] │ V │
[13:2]───[9.33/6] │ V │
[13:1]───[9.35/6] │V │
[13:1]───[9.37/6] │V W T │
[13:2]───[9.39/6] │ V W T │
[13:3]───[9.41/6] │ V │
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[13:6]───[9.47/6] │ V │
[13:7]───[9.49/6] │ V T U │
[13:8]───[9.51/6] │ V T U │
[13:9]───[9.53/6] │ V │
[13:10]──[9.55/6] │ V │
[13:11]──[9.57/6] │ V │
[13:12]──[9.59/6] │ V │
[13:13]──[9.61/6] │ V W │
[13:14]──[9.64/6] │ V W │
[13:15]──[9.66/6] │ V │
[13:16]──[9.68/6] │ V │
[13:17]──[9.70/6] │ V │
[13:18]──[9.72/6] │ V │
[13:19]──[9.74/6] │ V │
[13:20]──[9.76/6] │ V │
[13:21]──[9.78/6] │ V │
[13:22]──[9.80/6] │ V │
[13:23]──[9.82/6] │ V │
[13:24]──[9.84/6] │ V │ 24/6 i
[13:25]──[9.86/6] │ V │
[13:26]──[9.88/6] │ V │
[13:27]──[9.90/6] │ V │
[13:28]──[9.92/6] │ V │
[13:29]──[9.94/6] │ V │
[13:30]──[9.96/6] │ V │
[13:31]──[9.99/6] │ V │
[13:32]──[10.01/6] │ V │
[13:33]──[10.03/6] │ V │
[13:34]──[10.05/6] │ V │
[13:35]──[10.07/6] │ V │
[13:36]──[10.09/6] │ V │
[13:37]──[10.11/6] │ V │
[13:38]──[10.13/6] │ V│
[13:38]──[10.15/6] │ V│
[13:37]──[10.17/6] │ V │
[13:36]──[10.19/6] │ V │
[13:35]──[10.21/6] │ T V │
[13:34]──[10.23/6] │ T V │
[13:33]──[10.25/6] │ V │
[13:32]──[10.28/6] │ V │
[13:31]──[10.30/6] │ V │
[13:30]──[10.32/6] │ V │
[13:29]──[10.34/6] │ T U V │
[13:28]──[10.36/6] │ T U V │
[13:27]──[10.38/6] │ V │
[13:26]──[10.40/6] │ V │
[13:25]──[10.42/6] │ V │
[13:24]──[10.44/6] │ V │
[13:23]──[10.46/6] │ T V W │
[13:22]──[10.48/6] │ T V W │
[13:21]──[10.50/6] │ V │
[13:20]──[10.52/6] │ V │ 20/6 >
[13:19]──[10.55/6] │ V │
[13:18]──[10.57/6] │ V │
[13:18]──[10.57/6] │ V │
[13:19]──[10.59/6] │U U * W T│
[13:20]──[10.61/7] │U U V W T│
```
