diff --git a/naive-nlu/tree_nlu/knowledge_base.py b/naive-nlu/tree_nlu/knowledge_base.py
index 4c27700..e00bc0d 100644
--- a/naive-nlu/tree_nlu/knowledge_base.py
+++ b/naive-nlu/tree_nlu/knowledge_base.py
@@ -49,6 +49,7 @@ class KnowledgeBase(object):
 
 
     def process(self, row):
+        row = row.lower()
         knowledge_before = copy.deepcopy(self.knowledge)
         logging.info("\x1b[7;32m> {} \x1b[0m".format(row))
         tokens = parsing.to_tokens(row)
diff --git a/naive-nlu/tree_nlu/knowledge_evaluation.py b/naive-nlu/tree_nlu/knowledge_evaluation.py
index a24c07d..ed48f85 100644
--- a/naive-nlu/tree_nlu/knowledge_evaluation.py
+++ b/naive-nlu/tree_nlu/knowledge_evaluation.py
@@ -41,17 +41,32 @@ def get_subquery_type(knowledge_base, atom):
 
 
 def property_for_value(knowledge_base, value):
-    return knowledge_base[value]['as_property']
+    if 'as_property' in knowledge_base[value]:
+        return knowledge_base[value]['as_property']
+
+    return knowledge_base[value].get('groups', set(['noun']))
 
 
 def modifiable_property_from_property(prop, path, value):
     def getter():
         nonlocal prop, path, value
-        return (path in prop) and prop[path] == value
+        if isinstance(path, set):
+            # If the property is from a set, it's true if any possible
+            # path has a element as true
+            return any(map(lambda possible_path: ((possible_path in prop)
+                                                  and
+                                                  (prop[possible_path] == value)),
+                           path))
+        else:
+            return (path in prop) and prop[path] == value
 
     def setter():
         nonlocal prop, path, value
-        prop[path] = value
+        if isinstance(path, set):
+            for possible_path in path:
+                prop[possible_path] = value
+        else:
+            prop[path] = value
 
     return ModifiableProperty(
         getter=getter,