[rules-users] not operation available in drools

[learner]

I have a scenario like below 

Rule a 

When 

            ! ( 

(aaa == “bbb”) && 

(bbb == “aaa”) 

            ) 

Then 

            // do smth 

End 

I’m looking for an operator to reverse the evaluation result of the
expression in the brackets. Is this possible

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