Twenty-one chapters, 134 problems, and a queue that decides what you re-solve. Read the chapter, then prove it.
your notes stay yours — the pact only counts
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Twenty-one chapters, in order. Read, then prove it.
Every problem in the course. For when you know what you want.
Anything you needed a hint on comes back. Three rungs — 3 days, 7 days, 14 days — then it's settled.
Two people, same course. Counts only — never notes.