eq { diff { hop { filter_eq { all_rows ; venue ; athens , greece } ; year } ; hop { filter_eq { all_rows ; venue ; helsinki , finland } ; year } } ; -1 } = true
select the rows whose venue record fuzzily matches to athens , greece . take the year record of this row . select the rows whose venue record fuzzily matches to helsinki , finland . take the year record of this row . the second record is 1 larger than the first record .