CASE
    WHEN "%CC0002%" ="Seen" AND "%TT0002%" ='' THEN ''    
    WHEN "%CC0002%" ="Seen" AND "%TT0002%" ='SEEN' THEN 'POSITIVE'  
    WHEN "%CC0002%" ="Seen" AND "%TT0002%" ='Non seen' THEN 'Negative'  
    ELSE NULL
END

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