class CustomSet
  attr_reader :data

  def initialize(init_data)
    @data = init_data
  end

  def exist?(element)
    @data.each do |record|
      if element == record
        return true
      end
    end
    false
  end

  def add(element)
    @data << element unless exist?(element)
  end

  def remove(element)
    @data.delete(element)
  end
end