(Program
  (Object
    (Pair
      { (Identifier) -> (SymbolLiteral) }
      { (StringLiteral) -> (StringLiteral) })
  {+(Pair
      (SymbolLiteral)
      (IntegerLiteral))+}
    (Pair
      { (Identifier) -> (StringLiteral) }
      { (IntegerLiteral) -> (Boolean) })
  {+(Pair
      (SymbolLiteral)
      (IntegerLiteral))+}
  {-(Pair
      (Identifier)
      (Boolean))-}))