(Program
  (Subscript
  { (Identifier)
  ->(Identifier) }
  {+(TextElement)+}
  {-(Identifier)-})
  (Subscript
  { (Identifier)
  ->(Identifier) }
  { (Symbol)
  ->(Symbol) })
{-(Assignment
  {-(Subscript
    {-(Identifier)-}
    {-(Identifier)-})-}
  {-(Integer)-})-})