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Create 'n' number random pairwise combination of words

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# 1  
Create 'n' number random pairwise combination of words

File 1 contains the list of words that needed to be randomly paired:


File 2 contains the pairs that should not be used (in any solution) during random pairing.


Dog-Elephant, Fish-Cat, Frog-Monkey should also be deleted as their pair appeared in File2 (irrespective to direction)
I need total 6 solutions and in every solution, there should be maximum of 5 pairs.
Tiger-Cat and Cat-Tiger should be treated as same and if they appear together in any solution one should be deleted.
Same pair such as Frog-Dog can be appear in many solutions.

The output looks like (here one one solution is given).


# 2  
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