(Program
{+(Tuple
  {+(Identifier)+}
  {+(Identifier)+}
  {+(Identifier)+})+}
  (Tuple
  {-(Identifier)-}
    (Identifier)
  {+(Identifier)+})
{+(
  {+(Identifier)+})+}
{-(Tuple
  {-(Identifier)-}
  {-(Identifier)-}
  {-(Identifier)-})-})