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