(Statements
{+(LessThan
  {+(Send
    {+(Identifier)+})+}
  {+(Send
    {+(Identifier)+})+})+}
{+(GreaterThan
  {+(Send
    {+(Identifier)+})+}
  {+(Send
    {+(Identifier)+})+})+}
{-(LessThanEqual
  {-(Send
    {-(Identifier)-})-}
  {-(Send
    {-(Identifier)-})-})-}
{-(GreaterThanEqual
  {-(Send
    {-(Identifier)-})-}
  {-(Send
    {-(Identifier)-})-})-})