And then we look at all of these over here fibonacci (2); we know that fibonacci(2) results in fib(1) + fib(0) so let me write that over here so over here is fibbonacci(1) plus fibbonacci(0) fibb is short for fibonacci and then we know fibbonacci of 1 1 is less than 2, so return n so this is going to return 1 fibonacci of 1 just returns 1 fibonacci of 0 and 0 is less than 2, returns 0 so fibonacci(0) just returns 0 fibonacci of 0 returns 0 fibonacci of 1 returns 1 fibonacci of 0 returns 0 and then fibonacci of 1 returns 1 fibonacci of 0 returns 0