What was the pen name of Samuel Langhorne Clemens?
what was the pen name of samuel langhorne clemens
FreebaseQA-train-16536.P0
samuel langhorne
langhorne
m.05d579t
base.semanticnames.personal_name_element.people_with_this_name..base.semanticnames.personal_name.person
m.014635
mark twain