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class Person attr_accessor :lastname,:firstname,:age def initialize(firstname,lastname,age) @lastname = lastname @firstname = firstname @age = age end def name "#{@firstname} #{@lastname}" end def to_s "Hello my name is #{name} and my age is #{@age}" end end people = [Person.new("joe","blow",34),Person.new("lala","blow",73), Person.new("mary","watson",23),Person.new("annie","red",5), Person.new("bob","builder",51),Person.new("blah","red",6), Person.new("blah","red",2)] sorted_people = people.sort_by{|person| [person.lastname,person.firstname,person.age]} sorted_people.each {|person| puts person }