Collections Ruby

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class AllVowels
  include Enumerable
  @@vowels = %w{a e i o u}
  def each
    @@vowels.each { |v| yield v }
  end
end
x = AllVowels.new
x.collect { |i| i + "x" }
x.detect { |i| i > "j" }
x.select { |i| i > "j" }
x.sort
x.max
x.min