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select  distinct (s.C)
  from  TTTT as t, TTTT as s    
 where  something
        and s.A = t.A 
        and s.B = t.B;

select  distinct (s.C)
  from  TTTT.t, TTTT.s          
 where  something
        and s.A = t.A 
        and s.B = t.B;