sieve: 4 25 1229 
fib: 6765 46368 317811 
ack: 9 61 253 509 
does: 45 
leave: 17 
?do: never
while: 3 2 1 
nested loops (J and I):
   1   2
   2   4
tick/execute: 9 
string: a small string
ok