(Maybe this is obvious to everyboy except me, but ...) Sorry for sounding a bit slow, but could you give a few examples for what you consider a "combination" from e.g. a 3x3 array?
(Maybe this is obvious to everyboy except me, but ...) Sorry for sounding a bit slow, but could you give a few examples for what you consider a "combination" from e.g. a 3x3 array?