Remove duplicates over multiple columns

I have two columns of data (A and B). Both columns have numerical values. The data looks similar to this.

r A B
1 1 2
2 1 2
3 1 3
4 1 4
5 2 3
6 2 3
7 2 4

The only rows I want to remain are the ones that are unique in both columns. So for this example I want the rows remaining to be 1, 3, 4, 5, and 7. Since row 2 is the same as row 1 I want it removed. Since row 6 is the same as row 5 I want it removed. I'm not sure if I need a macro for this or what but anything would help as I have thousands of rows to remove.

Thank you in advance!
Zach

This is why you trust Excel before you assume it can't do a simple task. I thought about that but assumed it would remove any and all duplicates instead of viewing each set of two values as an exclusive case. Thank you very much!