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DOCUMENTATION:
  name: flatten
  version_added: "2.5"
  short_description: flatten lists within a list
  description:
    - For a given list, take any elements that are lists and insert their elements into the parent list directly.
  positional: _input, levels, skip_nulls
  options:
    _input:
      description: First dictionary to combine.
      type: dict
      required: true
    levels:
      description: Number of recursive list depths to flatten.
      type: int
    skip_nulls:
      description: Skip C(null)/C(None) elements when inserting into the top list.
      type: bool
      default: true

EXAMPLES: |

    # [1,2,3,4,5,6]
    flat: "{{ [1 , 2, [3, [4, 5]], 6] | flatten }}"

    # [1,2,3,[4,5],6]
    flatone: "{{ [1, 2, [3, [4, 5]], 6] | flatten(1) }}"

RETURN:
  _value:
    description: The flattened list.
    type: list