(Program
  (If
  { (Identifier)
  ->(Identifier) }
    ([]
    {-(Identifier)-})
  { (If
    {-(Identifier)-}
    {-(
      {-(Identifier)-})-}
    {-(Identifier)-})
  ->(Empty) })
{+(If
  {+(Identifier)+}
  {+([])+}
  {+(Empty)+})+})