In the meantime you both do a lot of coding.
When she finally gets back, you discover a critical flaw in your VCS.
Because you’ve both been using the same numbering system, you each have directories named “snapshot-114”, “snapshot-115”, and so on, but with different contents!
To make matters worse, you don’t even know who authored the changes in those new snapshots.
Together, you devise a plan for dealing with these problems.