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