Re: printf -> bad argument list

>> printf("%w", [[1],[2]]).

>Use as many %w as you have in the argument list of printf. Thus, the
...
>printf("%w,%w", [[1],[2]]).

Or, if the argument you are trying to print is [[1],[2]], then you need
to enclose it in an extra set of square brackets:

printf("%w", [ [[1],[2]] ]).

(In general, you should always surround the items you want to print with
square brackets, even if it is a single item. This avoids the above
confusion of wheather you wanted to print two items, or have a single item
which is a list)

Cheers,

Kish