(Program
{+(BOr
  {+(Identifier)+}
  {+(Identifier)+})+}
{+(RShift
  {+(Identifier)+}
  {+(Identifier)+})+}
{+(BXOr
  {+(Identifier)+}
  {+(Identifier)+})+}
{-(BAnd
  {-(Identifier)-}
  {-(Identifier)-})-}
{-(LShift
  {-(Identifier)-}
  {-(Identifier)-})-})