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Topics
	astar/AStar.h
	Sequential A* over a Domain, with the OPEN list Open.
	astar/IDAStar.h
	The iterative-deepening A* search of a Domain.
	astar/DDDAStar.h
	The A* search of a Domain with delayed duplicate detection on the disk.
	astar/HDAStar.h
	Hash Distributed A* on a shared-memory machine.
	astar/SPAStar.h
	Simple Parallel A*: one OPEN and one CLOSED list shared by the workers.
	astar/MQAStar.h
	MultiQueue A*: one relaxed OPEN list and one CLOSED list shared by the workers.
	astar/SafePBNF.h
	Safe Parallel Best-NBlock-First search.
	astar/PASE.h
	Parallel A* for Slow Expansions.
	astar/FarmAStar.h
	A master-worker parallel A* on a farm with feedback.
	astar/HDAStarMPI.h
	Hash Distributed A* with one MPI process per worker.

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