Has anybody an idea how to formalize the following task?

A list of 4 sublists with 2 elements:

'((1 2) (3 4) (5 6) (7 8)))

 

==> All the possible combinations of either one or the other number in the sublist:

 

'(
(1 3 5 7)
(1 4 5 7)
(1 3 6 7)
(1 4 6 7)
(1 3 5 8)
(1 4 5 8)
(1 3 6 8)
(1 4 6 8)
(2 3 5 7)
(2 4 5 7)
(2 3 6 7)
(2 4 6 7)
(2 3 5 8)
(2 4 5 8)
(2 3 6 8)
(2 4 6 8)
)

Did I miss a combination?

Thanks for help.

Achim

(cartesian '((1 2) (3 4) (5 6) (7 8)))

 

Perfect. I missed this one ...

Thanks a lot. Achim