(Statements
  (Send
    (Identifier)
    (Function
      (Empty)
    {+(Identifier)+}
    { (Statements)
    ->(Plus
      {+(Identifier)+}
      {+(Integer)+}) }))
{-(Send
  {-(Identifier)-}
  {-(Function
    {-(Empty)-}
    {-(Send
      {-(Identifier)-})-})-})-}
{-(Send
  {-(Identifier)-}
  {-(Function
    {-(Empty)-}
    {-(Identifier)-}
    {-(Identifier)-}
    {-(Identifier)-}
    {-(Integer)-})-})-}
{-(Function
  {-(Empty)-}
  {-(Function
    {-(Empty)-}
    {-(Statements)-})-})-}
{-(Function
  {-(Empty)-}
  {-(Function
    {-(Empty)-}
    {-(Send
      {-(Identifier)-})-})-})-}
{-(Function
  {-(Empty)-}
  {-(Identifier)-}
  {-(Function
    {-(Empty)-}
    {-(Integer)-})-})-}
{-(Function
  {-(Empty)-}
  {-(Identifier)-}
  {-(Identifier)-}
  {-(Statements
    {-(Identifier)-}
    {-(Identifier)-})-}
  {-(Function
    {-(Empty)-}
    {-(Statements)-})-})-})