# So here we can observe that every element of the 
# array is only produced 'once'

# E.g (0,1,2) versus (0,1,1,2) 

$result1 = [
            [ 0, 'C----' ],
            [ 1, '----C' ],
            [ 2, '---GC' ]
          ];

# E.g (0,1,2,3) versus (0,1,1,2,2,3) 
$result2 = [
            [ 0,'C----' ],
            [ 1,'----C' ],
            [ 2,'----T' ],
            [ 3,'----C' ],
           ];