Distinct values with two columns

Hi there,

I have something simple to do but I only find complexs way to do it so I must miss something.

Let Say I have two columns TYPE AND TYPE2 which will contain the same domain values.

I want to have the distinct value whatever the order of the values.

TYPE        TYPE2

AAA           BBB

AAA           CCC

BBB           AAA

BBB           CCC

CCC          BBB

At the end I want only the distinct combinaisons :

TYPE        TYPE2

AAA           BBB

AAA           CCC

AAA           CCC

BBB           AAA

BBB           CCC

CCC          BBB

Any ideas ? 

Thanks