diff --git a/mapper.py b/mapper.py
index 9fa3def..4efaece 100644
--- a/mapper.py
+++ b/mapper.py
@@ -6,9 +6,15 @@
     # remove leading and trailing whitespace
     line = line.strip()
 
+    # make  lower case
+    line = line.lower()
+
     # split the line into words; splits on any whitespace
     words = line.split()
 
+    # output tuples (word, 1) in tab-delimited format
+    stopwords = set(['the', 'and', 'a', 'for', 'I', 'go', 'four', 'three', 'be', 'not', 'to', 'railing'])
+
     # output tuples (word, 1) in tab-delimited format
     for word in words:
         print '%s\t%s' % (word, "1")