Thanks for the question. Rolling is how we keep an index continuous even though the underlying markets expire. For the NBA index, each game market resolves, but the rating just updates after the final result using the pre-game odds and carries forward through the season. Weather is a clearer “rolling” case: the index is a blend of the active near-term contracts (today/tomorrow), and when those resolve we drop them and swap in the next equivalent markets, so the index stays continuous while the inputs change.