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Find pairs in two spreads

Hi!

I have two spreads with the same count:

0 3 8 5
3 0 4 6

Each two elements at the same index form a pair.

(0,3)(3,0)(8,4)(5,6)

There will be combinations of pairs occuring twice, in switched order.

(0,3)(3,0)

How can I find these doubles and throw them out so my spreads look like

0 8 5
3 4 6

?

this is a classic problem which is very hard to solve by basic spread operations. maybe describe a bit more what this should solve and how you ran into this problem. there might be a better solution which avoids this problem all together…