This challenge is named venus, and is located within module world.
When users start this challenge, their environment will have:
/flag/challenge/takeoff/challenge/launch
In this challenge, takeoff is a statically instanced file.
There is also files .init, planets.txt, and launch.j2 which students will never see.
At run time, .init reads in planets.txt to construct launch from the templated file launch.j2.
This gives the challenge static instancing dependent upon the flag.
In general, it is best to define a pool of static instanced files prior, so that this setup does not need to be performed at runtime every challenge start.
However, for simple cases, this may be acceptable.
It is important to note, however, that the results of these static instances are still dependent upon the flag, which means running the challenge with a different flag (e.g. with a practice flag), will fundamentally change the instance.