    deferred class
    	COUNTABLE [G]

    General
    	cluster: base
    	description:
    		"Infinite containers whose items are in one-to-one
    		correspondence with the integers."

    Ancestors
    	INFINITE* [G]

    Queries
    	changeable_comparison_criterion: BOOLEAN
    	Full: BOOLEAN
    	has (v: G): BOOLEAN
    	Is_empty: BOOLEAN
    	item (i: INTEGER_32): G
    	linear_representation: LINEAR [G]
    	object_comparison: BOOLEAN

    Commands
    	compare_objects
    	compare_references