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Is it OK to use it like this?



Diversity of real needs and attitudes concerning priorities for satisfaction is what enables win-win outcomes in the most difficult circumstances, if both parties do their best to achieve this.
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The bold part seems OK to me, but if you mean the diversity of both those things (which "is what enables" indicates you do) then I would be tempted to flag this by inserting another "of":

"Diversity of real needs and of attitudes concerning priorities for satisfaction is what enables..."
Comments  
I see what you mean. Thank you Mr Wordy.