I have two columns..

ID MONTH
100 Jan-04 Unique
200 Jan-04 Unique
200 Jan-04
300 Feb-04 Unique
300 Feb-04
300 Feb-04


what I want is a macro to write "Unique" in the third column if " ID " is
there only once in a month. and in case its there more than once in the same
month. only one "Unique" in the third column


any help apprecaited