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+implementation module SimpleFileIO
+
+import StdBool, StdFile, StdList, StdMaybe
+
+// 1.
+readFile :: String *env -> (Maybe String,*env) | FileSystem env
+readFile ...
+
+writeFile :: String String *env -> (Bool,*env) | FileSystem env
+writeFile ...
+
+// 2.
+readLines :: String *env -> (Maybe [String],*env) | FileSystem env
+readLines ...
+
+writeLines :: String [String] *env -> (Bool,*env) | FileSystem env
+writeLines ...
+
+// 3.
+mapFile :: String String (a -> b) *env -> (Bool,*env) | FileSystem env & ... a & ... b
+mapFile ...