(Statements
{+(LowPrecedenceAnd
  {+(Send
    {+(Identifier)+})+}
  {+(Send
    {+(Identifier)+})+})+}
{-(LowPrecedenceOr
  {-(Send
    {-(Identifier)-})-}
  {-(Send
    {-(Identifier)-})-})-}
{-(LowPrecedenceAnd
  {-(LowPrecedenceOr
    {-(Send
      {-(Identifier)-})-}
    {-(Send
      {-(Identifier)-})-})-}
  {-(Send
    {-(Identifier)-})-})-})