futil.dofile("data_structures", "bitarray")
futil.dofile("data_structures", "default_table")
futil.dofile("data_structures", "deque")
futil.dofile("data_structures", "pairing_heap")
futil.dofile("data_structures", "point_search_tree")
futil.dofile("data_structures", "set")
futil.dofile("data_structures", "sparse_graph") -- requires default_table and set