    class
    	HEADER

    General
    	cluster: mail
    	description: "Objects that contains all the information relative to any header. Headers can only have email addresses informations."
    	create: make_with_entries, make

    Ancestors
    	ANY

    Queries
    	entries: ARRAYED_LIST [STRING_8]
    	multiple_entries: BOOLEAN
    	unique_entry: STRING_8

    Commands
    	add_entries (list: ARRAY [STRING_8])
    	add_entry (s: STRING_8)
    	enable_contains_addresses
    	enable_multiple_entries
    	make (item: STRING_8)
    	make_with_entries (list: ARRAY [STRING_8])
    	remove_entry (entry: STRING_8)
    	remove_i_th_entry (i: INTEGER_32)