[R] merge function in R?

[JesperHybel]

I think it would be helpful if you could clarify youre question - do you want
distinct sets - maybe use 

unique()

but why (5,20) when its (5,10) in the row in youre example? What criteria do
you want the function to select the "sets" by and what kind of output do you
need? 

Maybe it's just me who dosn't get the question..sr
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