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[tlaplus] Merging EXCEPT statements


Suppose I have a function a, that has domain Z. Suppose x and y are in Z. 
I'm writing an action where both a[x] and a[y] must be changed.

I have one line of the following form:   
  a' = [a EXCEPT ![x] = ...]

and another like so:                             
 a' = [a EXCEPT ![y] = ...]

 How would I be able to write this altogether as one? Having both doesn't seem to work with Model Checking as count = 0 for those lines.

I apologize if I'm using the wrong terms to explain my problem. 

Thanks for any help

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