Can PICT handle independent parameters

Can PICT (=Pairwise Independent Combinatorial Testing) handle/model independent parameters. For example in following input a and b are independent, so they should not be combined.

Input in PICT:
a: 1, 2, 3, 4
b: 5, 6, 7, 8

//some line which models the independence: a independent of b

Output, that I would expect:
a b
1 5
2 6
3 7
4 8

This example, with only 2 parameters, of course normally would not make much sense, but it's illustrative. The same could be applied to 3 parameters (a,b,c), where a is independent of b, but not c. The main goal of declaring parameters as independent would be the reduce the number of tests. I read the paper/user guide to PICT, but I didn't found any useful information.