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EXAMPLE 1:
      
      #Example Python class
      class Reverse:
          #Iterator for looping over a sequence backwards.
          def __init__(self, data):
              self.data = data
              self.index = len(data)

          def __iter__(self):
              return self

          def __next__(self):
              if self.index == 0:
                  raise StopIteration
              self.index = self.index - 1
              return self.data[self.index]

      #Example output
      >>> rev = Reverse('spam')
      >>> iter(rev)
      <__main__.Reverse object at 0x00A1DB50>
      >>> for char in rev:
      ...     print(char)
      ...
      m
      a
      p
      s
      
    
      
      #Example Python clamp function
      def clamp(num, smallest, largest):
          return max(smallest, min(num, largest))