[Tutor] Recursion

[Daniel Yoo]

On Wed, 6 Jun 2001, Daniel Yoo wrote:

> ###
> def two_at_a_time(L):
>     source = one_at_a_time(L)
>     c = []
>     for x in L:
>         for s in source:
>             c.append([x] + s)
> ###

Oops.  Ok, I need to make a correction of a very silly bug:


###
def two_at_a_time(L):
    source = one_at_a_time(L)
    c = []
    for x in L:
        for s in source:
            c.append([x] + s)
    return c
###

The program I wrote did all this neat work, but it never gave the answer
back to us!  Ugh.  Same bug with three_at_a_time().  Sorry about that.