The `FBA` contract implements a Fair Batch Auction system for placing, canceling, and executing orders. It maintains separate heaps for bids and asks using the `FBAHeap` library and `Suave` data structures. Users can place and cancel orders, which are stored and managed in these heaps. The contract matches orders based on a clearing price and executes fills, emitting events for order placements, cancellations, and fills.

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