diff --git a/lib/doc/Compare.hs b/lib/doc/Compare.hs
new file mode 100644
index 000000000..e40959b1b
--- /dev/null
+++ b/lib/doc/Compare.hs
@@ -0,0 +1,32 @@
+lang1 = "Eng"
+lang2 = "Tha"
+
+-- to write a comparison for two languages
+
+main = do
+  ss1 <- readFile (exx lang1) >>= return . lines
+  ss2 <- readFile (exx lang2) >>= return . lines
+  mkExx (ss1, ss2)
+
+exx lang = "api-examples-" ++ lang ++ ".txt"
+
+mkExx sss = case sss of
+  (s1:ss1,s2:ss2) | isMsg s1 -> mkExx (ss1,s2:ss2)
+  (s1:ss1,s2:ss2) | isMsg s2 -> mkExx (s1:ss1,ss2)
+  (s1:ss1,s2:ss2) | s1 /= s2 -> 
+     putStrLn (drops s1) >> putStrLn (drops s2) >> putStrLn [] >> mkExx (ss1,ss2) -- show the strings
+  (s1:ss1,s2:ss2) | s1 == s2 && not (isJunk s1) -> 
+     putStrLn (drops s1) >> mkExx (ss1,ss2) -- show the term
+  (s1:ss1,s2:ss2) | s1 == s2 -> mkExx (ss1,ss2)
+  _ -> return ()
+
+isMsg s = case s of
+  '>':_ -> False
+  _ -> True
+
+drops = drop 4
+
+isJunk s = any (flip elem s) "*-"
+
+
+