Performance (Update Delay) Fast (O(1) propagation) Slow (heap allocations and nested chaining) Fast (pruned update, lazy eval, diffing) Memory Usage Very low (stack + signals) High (many ...

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**FILE** The District's Child Support Services Division Amnesty Program, announced by Attorney General Brian Schwalb, runs now through Sept. 19. (Robert R. Roberts/The Washington Informer) D.C.