She titled it: principles_corp_fin_14e_solutions_ch18.md .

Then she found it.

The page loaded in raw markdown. It wasn't official. It was better. Each problem was annotated with not just the numeric solution, but a short, handwritten-style note in ASCII:

Three months later, the repo had 342 stars. Someone from Frankfurt added notes on international cost of capital. A retired CFO from Chicago corrected a levered beta calculation. A second-year analyst in Singapore reformatted everything into beautiful LaTeX.

"Don't," she whispered to herself, fingers hovering over the keyboard.

At 8:30 AM, she handed in the assignment. Her professor raised an eyebrow at her derivation in 17.9. "You caught the personal tax effect," he said. "Most PhD students miss that."