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IF field1 = x and field2 = (y or z) then ...

IF field1 = x and field2 = (y or z) then ...
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Is there a way to use the IF , Then function this way?

I have these fields I am Querying

SID
CASENUMBER

I want to do something like this.

IF SID = "X999" AND CASENUMBER = "1234567890" or "0987654321" or "1122343234" THEN.

Is there a way to group the case numbers together so I don't have to write it out like.

IF SID = "X999" AND CASENUMBER = "1234567890" OR SID = "x999" AND CASENUMBER = "0987654321" OR SID = "X999" AND CASENUMBER = "." ?

Because I have like a gazillion case numbers and only about 25 SID's
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