Starting at one of the London Terminus stations, guess which station is the origin of this trip. The next station will always start with the last letter of the previous station. Hints will be the number of stations with colour corresponding to the line shown on the TfL map, and multiple numbers mean connection needed.
16 next to debden and N greenwich should be red
Also, Embankment only gets a couple trains to Tooting Bec in the peak hours. Southbound trains almost always go to Battersea/Kennington