anchor.diff:  
   p
       |  Returns a list of unicode strings, describing the tags. Each tag string
  -    |  will be of the form either #[code ""], #[code "O"] or
  +    |  will be of the form of either #[code ""], #[code "O"] or
       |  #[code "{action}-{label}"], where action is one of #[code "B"],
       |  #[code "I"], #[code "L"], #[code "U"]. The string #[code &quot;-&quot;]
       |  is used where the entity offsets don't align with the tokenization in the
  
positive.code:         +cell
              |  Unicode strings, describing the
              |  #[+a("/api/annotation#biluo") BILUO] tags.
  
  
  
negative.code: 
  +aside-code("Example").
      from spacy.gold import biluo_tags_from_offsets
  
      doc = nlp('I like London.')
      entities = [(7, 13, 'LOC')]
      tags = biluo_tags_from_offsets(doc, entities)
      assert tags == ['O', 'O', 'U-LOC', 'O']
  
  