I have an excel spreadsheet that has 2 columns. Col A is customer# and Col B
is invoice #.
A customer# can have many invoice#s
A customer# can have many rows with the same inv#.
An invoice# can only be associated with 1 customer#

I need to create a spreadsheet that shows each customer with the associated
invoice#. Each customer#/invoice# should only show once.

for example:

cust# invoice#
1 100
1 100
1 101
2 200
3 300
3 300


The result would be:

cust# inv#
1 100
1 101
2 200
3 300

How do I get rid of the extra rows?