HOW TO RETURN m ack n:
SELECT:
m=0: RETURN n+1
m>0 AND n=0: RETURN (m-1) ack 1
m>0 AND n>0: RETURN (m-1) ack (m ack (n-1))
FOR m IN {0..3}:
FOR n IN {0..8}:
WRITE (m ack n)>>6
WRITE /