2 files changed, 17 insertions, 9 deletions
diff --git a/mammoth/docx/document_xml.py b/mammoth/docx/document_xml.py
index 8e8dda8..71d744c 100644
--- a/mammoth/docx/document_xml.py
+++ b/mammoth/docx/document_xml.py
@@ -91,6 +91,10 @@ def _create_reader(numbering):
     @handler("w:tab")
     def tab(element):
         return results.success(documents.tab())
+        
+    @handler("w:ins")
+    def ins(element):
+        return _read_xml_elements(element.children)
     
     def read(element):
         handler = _handlers.get(element.name)
@@ -106,7 +110,7 @@ def _create_reader(numbering):
 
     def _read_xml_elements(elements):
         return results.combine(map(read, elements)) \
-            .map(lambda values: lists.filter(None, values))
+            .map(lambda values: lists.collect(values))
     
     return read
 
diff --git a/mammoth/lists.py b/mammoth/lists.py
index 24fa7c4..a1e188e 100644
--- a/mammoth/lists.py
+++ b/mammoth/lists.py
@@ -1,11 +1,15 @@
 import sys
 
 
-__all__ = ["filter"]
-
-if sys.version_info[0] == 2:
-    filter = filter
-else:
-    import builtins
-    def filter(*args, **kwargs):
-        return list(builtins.filter(*args, **kwargs))
+def collect(values):
+    result = []
+    _collect(values, result)
+    return result
+
+
+def _collect(values, result):
+    for value in values:
+        if isinstance(value, list):
+            _collect(value, result)
+        elif value is not None:
+            result.append(value)