greater { hop { filter_eq { all_rows ; currency ; argentine peso ( ars ) } ; 1 usd = } ; hop { filter_eq { all_rows ; currency ; brazilian real ( brl ) } ; 1 usd = } } = true
select the rows whose currency record fuzzily matches to argentine peso  ars  . take the 1 usd = record of this row . select the rows whose currency record fuzzily matches to brazilian real  brl  . take the 1 usd = record of this row . the first record is greater than the second record .