and { eq { hop { filter_eq { all_rows ; headphone model ; ps500 } ; headphone class } ; hop { filter_eq { all_rows ; headphone model ; ps1000 } ; headphone class } } ; and { eq { hop { filter_eq { all_rows ; headphone model ; ps500 } ; headphone class } ; professional } ; eq { hop { filter_eq { all_rows ; headphone model ; ps1000 } ; headphone class } ; professional } } } = true
select the rows whose headphone model record fuzzily matches to ps500 . take the headphone class record of this row . select the rows whose headphone model record fuzzily matches to ps1000 . take the headphone class record of this row . the first record fuzzily matches to the second record . the headphone class record of the first row is professional . the headphone class record of the second row is professional .