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