How to remove duplicates in a specific manner?

How can i convert A=[1 1 2 2 3 3;1 1 2 2 3 3;1 1 2 2 3 3;1 1 2 2 3 3;7 7 8 8 9 9;7 7 8 8 9 9] to B=[1 2 3;1 2 3;7 8 9]? Thanks

Answer 1

[Thorsten]

B = unique(unique(A, 'rows')', 'rows')'

[armin farshbaf]

Thanks I appreciate the help