(Statements
  (If
  { (Identifier)
  ->(Identifier) }
    (Statements
    {+(Identifier)+}
      (Identifier)
    {-(Identifier)-})
    (Statements
    {-(If
      {-(Identifier)-}
      {-(Statements
        {-(Identifier)-}
        {-(Identifier)-})-}
      {-(Statements)-})-}
    {-(Statements
      {-(Identifier)-}
      {-(Identifier)-})-})))