and { only { filter_eq { all_rows ; name of the country ; serbia ( srb ) } } ; eq { hop { filter_eq { all_rows ; name of the country ; serbia ( srb ) } ; years in world group } ; 3 ( 2 - 3 ) } } = true
select the rows whose name of the country record fuzzily matches to serbia  srb  . there is only one such row in the table . the years in world group record of this unqiue row is 3  2  3  .