(Program
{+(Identifier)+}
{+(Plus
  {+(Identifier)+}
  {+(Identifier)+})+}
  (
    (Integer)
    (Integer)
    (Integer))
{+(
  {+(Integer)+}
  {+(Integer)+}
  {+(Integer)+})+}
{-(Identifier)-}
{-(
  {-(Integer)-}
  {-(Integer)-}
  {-(Integer)-})-}
{-(Plus
  {-(Identifier)-}
  {-(Identifier)-})-})