(Statements
  (Subscript
    (Send
    { (Identifier)
    ->(Identifier) })
  {+(TextElement)+}
  {-(Send
    {-(Identifier)-})-})
  (Subscript
    (Send
    { (Identifier)
    ->(Identifier) })
  { (SymbolElement)
  ->(SymbolElement) })
{-(Assignment
  {-(Subscript
    {-(Send
      {-(Identifier)-})-}
    {-(Send
      {-(Identifier)-})-})-}
  {-(Integer)-})-})