Validate event order in a funnel

Inputs: [EVENT SCHEMA], [FUNNEL STEPS], [SAMPLE EVENTS]. Define user/session identity, allowable reorder window and duplicate handling. Find events that violate the sequence. Output: A valid-path rule, anomaly table and test cases. Check: A conversion cannot occur before its prerequisite under the chosen rule. If essential information is missing, identify it rather than filling the gap with a guess. Distinguish late-arriving events from impossible sequences before labelling records invalid.