code: def group_paragraphs(indent_paragraphs):
      '''
      Group paragraphs so that more indented paragraphs become children of less
      indented paragraphs.
      '''
      # The tree consists of tuples of the form (indent, [children]) where the
      # children may be strings or other tuples
  
      root = Node(0, [], None)
      current_node = root
  
      previous_indent = -1
      for indent, lines in indent_paragraphs:
          if indent > previous_indent:
              current_node = create_child_node(current_node, indent, lines)
          elif indent == previous_indent:
              current_node = create_sibling_node(current_node, indent, lines)
          elif indent < previous_indent:
              current_node = create_uncle_node(current_node, indent, lines)
          previous_indent = indent
      return roof group_paragraphs(indent_paragraphs):
      '''
      Group paragraphs so that more indented paragraphs become children of less
      indented paragraphs.
      '''
      # The tree consists of tuples of the form (indent, [children]) where the
      # children may be strings or other tuples
  
      root = Node(0, [], None)
      current_node = root
  
      previous_indent = -1
      for indent, lines in indent_paragraphs:
          if indent > previous_indent:
              current_node = create_child_node(current_node, indent, lines)
          elif indent == previous_indent:
              current_node = create_sibling_node(current_node, indent, lines)
          elif indent < previous_indent:
              current_node = create_uncle_node(current_node, indent, lines)
          previous_indent = indent
      return root
docs: Group paragraphs so that more indented paragraphs become children of less
      indented paragraphs.