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YAML

List mistake

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This is a YAML list of books but it has one syntax mistake. What is this mistake?

books:
  1.The Canterville Ghost
  2.The Three Musketeers
  3.Gulliver's Travels

Select one option from the list

parent should start with the capital letter

items are separated from the parent with spaces

items start with a number instead of a hyphen

items are not in quotation marks

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