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def inexpensive
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  ["a","b","c"]
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end
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5-
  sleep(3)
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def expensive
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  sleep(1)
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  ["a","b","c"]
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end
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puts "fast"
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inexpensive.each do |item|
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puts "slow?"
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end
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puts "slow?"
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expensive.each do |item|
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  puts item
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end
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puts "will this run forever?"
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myArr = ["a","b","c"]
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myArr.each do |item|
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  myArr.push("x")
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end