I have the following 2D array

```
var items = [['al','bv','sd'],
             ['al','cc','ab'],
             ['cv','vv','sw'],
             ['al','bv','sd']
            ];

```

I need a function which will return me a similar array but with distinct values. For example, in the above array, `['al','bv','sd']` happens twice.

I would like the function to return me:

```
var items = [['al','bv','sd'],
             ['al','cc','ab'],
             ['cv','vv','sw']
            ];

```