( 2,     var)
(15,       c)
(11,       ,)
(15,       d)
(11,       ,)
(15,  result)
(12,       ;)
( 1,   const)
(15,       a)
( 9,       =)
(16,       1)
(11,       ,)
(15,       b)
( 9,       =)
(16,       2)
(12,       ;)
( 1,   const)
(16,       2)
(12,       ;)
(15,       c)
(10,      :=)
(16,       3)
(12,       ;)
(15,       d)
(10,      :=)
(16,       4)
(12,       ;)
(15,  result)
(10,      :=)
(15,       a)
( 5,       +)
(13,       ()
(15,       b)
( 6,       -)
(15,       c)
(14,       ))
( 5,       +)
(16,       9)
(12,       ;)
( 0,       .)