I have A, B columns,
and I want to do conditional-formatting for rows whose A is the same and
B is not the same.
I mean
X 1
Y 2
Z 3
Z 3
Y 1
X 2
because for all rows B column for X have different (1,2), so i want to
highlight them.
on the other hand,
for Z's B column have the same values(3) so I want them to be intact.

Am I clear?