RosettaCodeData/Task/Ackermann-function/ZED/ackermann-function.zed

(a) m n
M ZERO
(=) m 0
(add1) n

(a) m n
N ZERO
(=) n 0
(a) (sub1) m 1

(a) m n
DEFAULT
#true
(a) (sub1) m (a) m (sub1) n

(add1) n
=========
#true
(003) "+" n 1

(sub1) n
=========
#true
(003) "-" n 1

(=) n1 n2
=========
#true
(003) "=" n1 n2