If Data is the same in 2 columns

Hi,

I have a table, which has 2 datasets and a solid relationship between both. I have added a column with the formula "Column1 = CONTAINS(Table1,Table1[Column 1],Table1[Column 2])".

I wanted it to do the following...

Look in Column1 and if there is duplicate data in Column2, add a TRUE for that row, if not then FALSE.

However I only want it to look in the same ROW, whereas the above formula is looking at the entire table. So, it's currently showing as TRUE if duplicate data is in Column1 (on row 4, for example) and Column 2 (any other row). I would only want it for row 4, using the example given. I'm sure there is a simple way round this, but I can't get it.

Many thanks,

Rich