diff --git a/org_rw/dom.py b/org_rw/dom.py
index 6f0bce8..cda195c 100644
--- a/org_rw/dom.py
+++ b/org_rw/dom.py
@@ -17,18 +17,7 @@ class LogbookDrawerNode:
         self.children.append(child)
 
     def __repr__(self):
-        return "<LogBook: {}>".format(len(self.children))
-
-
-class ResultsDrawerNode:
-    def __init__(self):
-        self.children = []
-
-    def append(self, child):
-        self.children.append(child)
-
-    def __repr__(self):
-        return "<Results: {}>".format(len(self.children))
+        return "<Properties: {}>".format(len(self.children))
 
 
 class PropertyNode:
diff --git a/org_rw/org_rw.py b/org_rw/org_rw.py
index b4526be..c006d1d 100644
--- a/org_rw/org_rw.py
+++ b/org_rw/org_rw.py
@@ -98,7 +98,7 @@ RESULTS_DRAWER_RE = re.compile(r"^\s*:results:\s*$", re.I)
 CodeSnippet = collections.namedtuple("CodeSnippet", ("name", "content", "result"))
 
 # Groupings
-NON_FINISHED_GROUPS = (type(None), dom.ListGroupNode, dom.ResultsDrawerNode, dom.PropertyDrawerNode)
+NON_FINISHED_GROUPS = (type(None), dom.ListGroupNode)
 FREE_GROUPS = (dom.CodeBlock,)
 
 
@@ -181,9 +181,9 @@ def text_to_dom(tokens, item):
     in_description = False
     link_value = []
     link_description = []
-
+    
     contents = []
-
+    
     for tok in tokens:
         if isinstance(tok, LinkToken):
             if tok.tok_type == LinkTokenType.OPEN_LINK:
@@ -362,7 +362,7 @@ class Headline:
                     current_node.append(dom.Text(line))
                 else:
                     if type(current_node) not in NON_FINISHED_GROUPS:
-                        raise NotImplementedError('Not implemented node type: {}'.format(current_node))
+                        assert type(current_node) in NON_FINISHED_GROUPS
                     current_node = None
                     contents = []
                     tree.append(dom.Text(text_to_dom(line.contents, line)))
@@ -373,9 +373,7 @@ class Headline:
                     tree.append(current_node)
                     indentation_tree = [current_node]
                 if not isinstance(current_node, dom.ListGroupNode):
-                    if not isinstance(current_node, dom.ListGroupNode):
-                        logging.warning("Expected a {}, found: {} on line {}".format(dom.ListGroupNode, current_node, line.linenum))
-                        # This can happen. Frequently inside a LogDrawer
+                    assert isinstance(current_node, dom.ListGroupNode)
 
                 if len(indentation_tree) > 0 and (
                     (len(indentation_tree[-1].children) > 0)
@@ -449,21 +447,10 @@ class Headline:
                     current_node = dom.LogbookDrawerNode()
                     tree.append(current_node)
                 elif content.strip().upper() == ":END:":
-                    if current_node is None:
-                        logging.warning('Finished node (:END:) with no known starter')
-                    elif not (isinstance(
+                    assert isinstance(
                         current_node, dom.PropertyDrawerNode
-                    ) or isinstance(
-                        current_node, dom.LogbookDrawerNode
-                    ) or isinstance(
-                        current_node, dom.ResultsDrawerNode
-                    )):
-                        raise Exception('Unexpected node: {}'.format(current_node))
+                    ) or isinstance(current_node, dom.LogbookDrawerNode)
                     current_node = None
-                elif content.strip().upper() == ":RESULTS:":
-                    assert current_node is None
-                    current_node = dom.ResultsDrawerNode()
-                    tree.append(current_node)
                 else:
                     raise Exception("Unknown structural line: {}".format(line))
             else:
@@ -1489,9 +1476,6 @@ def parse_headline(hl, doc, parent) -> Headline:
 
     contents = parse_contents(hl["contents"])
 
-    if not (isinstance(parent, OrgDoc) or depth > parent.depth):
-        raise AssertionError("Incorrectly parsed parent on `{}' > `{}'".format(parent.title, title))
-
     headline = Headline(
         start_line=hl["linenum"],
         depth=depth,
@@ -1797,26 +1781,18 @@ class OrgDocReader:
             "list_items": [],
         }
 
-        while (depth - 1) > len(self.headline_hierarchy):
+        while (depth - 2) > len(self.headline_hierarchy):
             # Introduce structural headlines
             self.headline_hierarchy.append(None)
-        while depth <= len(self.headline_hierarchy):
+        while depth < len(self.headline_hierarchy):
             self.headline_hierarchy.pop()
 
         if depth == 1:
             self.headlines.append(headline)
         else:
-            parent_idx = len(self.headline_hierarchy) - 1
-            while self.headline_hierarchy[parent_idx] is None:
-                parent_idx -= 1
-            self.headline_hierarchy[parent_idx]["children"].append(headline)
+            self.headline_hierarchy[-1]["children"].append(headline)
         self.headline_hierarchy.append(headline)
 
-        if all([hl is not None for hl in self.headline_hierarchy]):
-            if not ([ len(hl['orig'].group('stars')) for hl in self.headline_hierarchy ]
-                    == list(range(1, len(self.headline_hierarchy) + 1))):
-                raise AssertionError('Error on Headline Hierarchy')
-
     def add_list_item_line(self, linenum: int, match: re.Match) -> int:
         li = ListItem(
             linenum,