diff --git a/.idea/dictionaries/jamie.xml b/.idea/dictionaries/jamie.xml
index 727aec9..448d4b5 100644
--- a/.idea/dictionaries/jamie.xml
+++ b/.idea/dictionaries/jamie.xml
@@ -1,6 +1,7 @@
 <component name="ProjectDictionaryState">
   <dictionary name="jamie">
     <words>
+      <w>adlib</w>
       <w>fmpxml</w>
       <w>futura</w>
       <w>ptulsconv</w>
diff --git a/ptulsconv/docparser/__init__.py b/ptulsconv/docparser/__init__.py
index e69de29..3531b6f 100644
--- a/ptulsconv/docparser/__init__.py
+++ b/ptulsconv/docparser/__init__.py
@@ -0,0 +1,15 @@
+from typing import Generator, Callable, Iterator
+
+
+def apply_appends(source: Iterator,
+                  should_append: Callable,
+                  do_append: Callable) -> Generator:
+    this_element = next(source)
+    for element in source:
+        if should_append(this_element, element):
+            this_element = do_append(this_element, element)
+        else:
+            yield this_element
+            this_element = element
+
+    yield this_element
diff --git a/ptulsconv/docparser/adr_entity.py b/ptulsconv/docparser/adr_entity.py
index 7394b23..2220183 100644
--- a/ptulsconv/docparser/adr_entity.py
+++ b/ptulsconv/docparser/adr_entity.py
@@ -1,5 +1,8 @@
-from .doc_entity import SessionDescriptor
-from .tagged_string_parser_visitor import parse_tags
+from .doc_entity import SessionDescriptor, TrackDescriptor, TrackClipDescriptor
+from typing import Optional, Generator, List, Callable
+from tagged_string_parser_visitor import parse_tags
+from itertools import chain
+from functools import reduce
 
 from fractions import Fraction
 # field_map maps tags in the text export to fields in FMPXMLRESULT
@@ -69,14 +72,18 @@ class ADRLine:
     optional: bool
     done: bool
 
+    @staticmethod
+    def from_clip(clip: TrackClipDescriptor,
+                  track: TrackDescriptor,
+                  session: SessionDescriptor) -> Optional['ADRLine']:
+        pass
 
-class ADRDocument:
-    document: SessionDescriptor
+    @staticmethod
+    def generate_lines(session: SessionDescriptor) -> Generator['ADRLine']:
+        for track in session.tracks:
+            for track_clip in track.clips:
+                line = ADRLine.from_clip(track_clip, track, session)
+                if line is not None:
+                    yield line
 
-    def __init__(self, session: SessionDescriptor):
-        self.document = session
-
-    def lines(self):
-        header_metadata = parse_tags(self.document.header.session_name)
-        #TODO continue
 
diff --git a/tests/test_utils.py b/tests/test_utils.py
new file mode 100644
index 0000000..2fcf226
--- /dev/null
+++ b/tests/test_utils.py
@@ -0,0 +1,20 @@
+import unittest
+
+from ptulsconv.docparser import apply_appends
+
+
+class MyTestCase(unittest.TestCase):
+    def test_something(self):
+        v = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+        expected = [1, 2, 7, 5, 6, 15, 9, 10]
+
+        should = (lambda x, y: y % 4 == 0)
+        do_combine = (lambda x, y: x + y)
+
+        r = apply_appends(iter(v), should, do_combine)
+        r1 = list(r)
+        self.assertEqual(r1, expected)
+
+
+if __name__ == '__main__':
+    unittest.main()