  The TextGraphs-13 Shared Task on Explanation Regeneration asked participants
to develop methods to reconstruct gold explanations for elementary science
questions. Red Dragon AI's entries used the language of the questions and
explanation text directly, rather than a constructing a separate graph-like
representation. Our leaderboard submission placed us 3rd in the competition,
but we present here three methods of increasing sophistication, each of which
scored successively higher on the test set after the competition close.
