Thankyou very much...

is there a website that you use to get all the available maple codes?

Thankyou very much for your answer, it finally works now.

I have got another question if you dont mind helping me with.

I have a set P={4,5,6,7,12,14,15}

in order to create permutations of the numbers in set P into sets of 3 I did the following:

with(Statistics):

>P={4,5,6,7,12,14,15};

> O := combinat[permute](P, 3); 

But this does not produce permutation of the same number in a set as the integers in P can be repeated more than once....for example {4,4,4} or {15,15,15}?

How can I do so?

Many Thanks