deferred class
	HIERARCHICAL [G]

General
	cluster: elks
	description: 
		"Hierarchical structures in which each item has zero or
		one immediate predecessor, and zero or more successors."

Ancestors
	TRAVERSABLE* [G]

Queries
	changeable_comparison_criterion: BOOLEAN
	for_all (test: FUNCTION [G, BOOLEAN]): BOOLEAN
	has (v: G): BOOLEAN
	is_empty: BOOLEAN
	item: G
	linear_representation: LINEAR [G]
	new_cursor: ITERATION_CURSOR [G]
	object_comparison: BOOLEAN
	off: BOOLEAN
	successor_count: INTEGER_32
	there_exists (test: FUNCTION [G, BOOLEAN]): BOOLEAN

Commands
	compare_objects
	compare_references
	do_all (action: PROCEDURE [G])
	do_if (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN])
	down (i: INTEGER_32)
	start
	up

Constraints
	non negative successor count

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