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irb(main):005:0> iterator = [1, 2, 3].each
=> #<Enumerator: [1, 2, 3]:each>
irb(main):006:0> iterator.next
=> 1
irb(main):007:0> iterator.next
=> 2
irb(main):008:0> iterator.next
=> 3
irb(main):009:0> iterator.next
Traceback (most recent call last):
2: from (irb):9
1: from (irb):9:in `next'
StopIteration (iteration reached an end)
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