lol, a mere 13, plus 2 single books where the entire series is listed on the chart as a whole (Culture, Dune)
best bit of the chart
Enjoy stories about orphaned farm boys? -> (only option) No -> Tough.
the same joke is done with "Like a little time travel with your love story?" but since i would answer "why would you want to read a love story without
time travel" it is less funny.