Hi everybody
i have a list on excel 2007 that displays the purchase of items on columns
A:E, each column showing one (1) item
I want to find what combination of items appears more times, especifically,
which combination of four (4) is the favorite mix

eg:
A B C D F
A C D E F
B C D E F
B C D F Z

in this example, the winner would be (B, C, D, E) as it appears 3 times
the main problem is that I have over 1,000 rows
and trying with =SUMPRODUCT(COUNTIF(A1:E1,$N$1:$R$1)) por each combination
would take forever...

is there a simpler, quicker way to do this??
i don´t know if concatenate, because the items can be on any column