and { only { filter_eq { filter_eq { all_rows ; location ; nijmegen } ; traction type ; electric } } ; eq { hop { filter_eq { filter_eq { all_rows ; location ; nijmegen } ; traction type ; electric } ; date ( from ) } ; 4 june 1911 } } = true
select the rows whose location record fuzzily matches to nijmegen . among these rows , select the rows whose traction type record fuzzily matches to electric . there is only one such row in the table . the date  from  record of this unqiue row is 4 june 1911 .