I have 3 columns, Column A and B are the data and Column C is the result.
Try to get the items from Column B which is not available in Column A.
I use this formula in C1 :

=filter(B1:B,countif(B1:B,A1:A)=0)

But got wrong result. For example , I should not get ‘d’ or ‘h’ or ‘k’

What is the correct formula ?