|  | # RUN: yaml-bench -canonical %s
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							|  | 
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							|  | # A document may be null.
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							|  | ---
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							|  | ---
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							|  | # This mapping has four keys,
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							|  | # one has a value.
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							|  | empty:
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							|  | canonical: ~
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							|  | english: null
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							|  | ~: null key
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							|  | ---
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							|  | # This sequence has five
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							|  | # entries, two have values.
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							|  | sparse:
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							|  |   - ~
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							|  |   - 2nd entry
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							|  |   -
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							|  |   - 4th entry
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							|  |   - Null
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