Problem 60929. Symmetric Pair

Asif Newaz

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Given an (n, 2) matrix, remove any symmetric pairs from the matrix. Keep the first occurrence. 
(2, 3) and (3, 2) are considered symmetric pairs.
For example, 
x = [1,2; 
        2,1; 
        3,2; 
         4,3]
Here, the 1st and 2nd row are a symmetric pair => (1,2) and (2,1). 
Keeping the first occurrence, the output should be - 
out = [1,2; 
           3,2; 
          4,3]