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Big O notation for story estimation
O(1) - Trivial, we've done something almost exactly like this and it wont take long to complete at all
O(log n) - Need to add a small capability then it's copy-pasta
O(n) - Simple, It's like things we've done before. No refactoring or architectural changes needed.
O(n^2) - Going to need to rework some things and watch out for regressions
O(n!) - Major rework needed, lots of risk
O(MG) - This is so complex or ill-defined that it may never complete
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