-import "Prelude"\r
-\r
-f :: Integer -> Maybe Integer\r
-f = index [(1,2),(2,4),(3,6),(4,8)]\r
-\r
-main = f 3\r
---\r
+import "Prelude"
+
+f :: Integer -> Maybe Integer
+f = index [(1,2),(2,4),(3,6),(4,8)]
+
+main = f 3
+--
6
\ No newline at end of file