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 The event for the external text entity 'X' has already been processed.
    
 Every external text entity must be processed and resolved by running exactly one external-text-entity
      rule. This error indicates that an external text entity event has been processed more than once. This can happen
      if, for example, the parsed markup is directed into multiple markup sink functions, and each of them
      performs a do markup-parse on their input.
      
 You can use the function split-external-text-entities to make sure that external text entity events
      are directed to only one markup sink.
    
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