(Statements
  (Negate
  { (Integer)
  ->(Integer) })
{ (Integer)
->(Integer) }
{+(Integer)+}
{+(Integer)+}
{+(Negate
  {+(Integer)+})+}
{+(Integer)+}
{ (Integer)
->(Integer) }
{+(Integer)+}
{+(Integer)+}
{+(Integer)+}
{+(Integer)+}
{+(Integer)+}
{+(Integer)+}
{-(Integer)-}
{-(Negate
  {-(Integer)-})-}
{-(Integer)-}
{-(Integer)-}
{-(Integer)-}
{-(Integer)-}
{-(Integer)-}
{-(Integer)-}
{-(Integer)-}
{-(Integer)-})