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  • $\begingroup$ Thanks, but does not actually do what I want. My question is not really clear. What I mean is that if there are {x,y,z}, {x,y,p}, so x and y are common, I need to output either the min(z,p) or the max (z,p). If there are no multiplicities I just need to print the sub element. Apologies for the unclearness - I edited the original question to make it clearer $\endgroup$ Commented Jan 29, 2020 at 17:59
  • $\begingroup$ @dadelutz, please see the updated version. $\endgroup$ Commented Jan 29, 2020 at 18:23
  • $\begingroup$ It works just fine. Thanks! $\endgroup$ Commented Jan 29, 2020 at 18:27