This tradition itself can be traced back a long way in political theory.
Imagine trying to trace back the food you ate six or four years ago.
The festival was first staged in 2004, but its history can be traced back a further two years.
Although the roots of the band can be traced back a few years earlier and 3000 miles to the east.
Although traditionally they trace back their beginnings to the days of the Ramayana and even beyond.
House tries to trace back his steps throughout the episode to find out the identity of this person.
This practice can be traced back some 7000 years, to ships on the Nile.
This is where many music cultures trace back their distant origins.
So I started tracing back the roots, like a lot of kids at the time.
Since then, records have been kept and maintained to trace back the town's legacy.