(Program
{+(Call
    (Identifier)
    (TextElement)
    (Identifier)
    (Empty))+}
{+(Call
    (Identifier)
    (TextElement)
    (Identifier)
    (Identifier)
    (Empty))+}
  (Call
    (Identifier)
  {+(TextElement)+}
  {-(TextElement)-}
    (Empty))
{-(Call
    (Identifier)
    (TextElement)
    (Null)
    (Empty))-}
{-(Call
    (Identifier)
    (TextElement)
    (Identifier)
    (Identifier)
    (Empty))-})