. mata
: a=1,1\1,1\1,2\2,1\2,2\1,1\2,1\2,1\1,2\2,2

: a
        1   2
     +---------+
   1 |  1   1  |
   2 |  1   1  |
   3 |  1   2  |
   4 |  2   1  |
   5 |  2   2  |
   6 |  1   1  |
   7 |  2   1  |
   8 |  2   1  |
   9 |  1   2  |
  10 |  2   2  |
     +---------+

: uniqrows(a)
       1   2
    +---------+
  1 |  1   1  |
  2 |  1   2  |
  3 |  2   1  |
  4 |  2   2  |
    +---------+