[rules-users] Absence Pattern question

[wendy]

Thanks,
  This did it:

rule "AnoB"
timer(int: 3m)
  when

   $a: A()
  not($b: B( this after[-1ms] $a))  
then 

 ....

I needed to add [-1ms] so it would not match things with A and B at the same
exact time.

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