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class FixedSizeQueue
    def initialize(size)
...
        end
    end
end

2:16% irb -r ./fsq.rb
irb(main):001:0> q = FixedSizeQueue.new(3)
...
=> #<FixedSizeQueue:0x9317c6c @max_size=3, @items=[3, 5, 7]>
irb(main):009:0> FixedSizeQueue.instance_methods(false)
=> [:pop, :push]