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Find, for each project, the highest ROWINDEX containing anon-zero estimate, and likewise for non-zero budget calculatecummulativesumsstart loopon projectend loopDataRow index containing non-zero estimateRow index containing non-zero budgetGroup by projectGet "high water marks"for each projectSet zero estimates to nullbeyond "high water mark"Set zero budgets to nullbeyond "high water mark"tidy up Moving Aggregation Group Loop Start Loop End Table Creator Rule Engine Rule Engine GroupBy Joiner Rule Engine Rule Engine Column Filter Find, for each project, the highest ROWINDEX containing anon-zero estimate, and likewise for non-zero budget calculatecummulativesumsstart loopon projectend loopDataRow index containing non-zero estimateRow index containing non-zero budgetGroup by projectGet "high water marks"for each projectSet zero estimates to nullbeyond "high water mark"Set zero budgets to nullbeyond "high water mark"tidy up Moving Aggregation Group Loop Start Loop End Table Creator Rule Engine Rule Engine GroupBy Joiner Rule Engine Rule Engine Column Filter

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