UNK, and does not reflect the smoothness of the underlying continuous distribution of certain attributes.
much work has been done in solving arithmetic (mitra and Baral, 2016;Hosseini et al., 2014;Roy and Roth, 2016), geometric (Seo et al., 2015), and algebraic problems (Zhou et al., 2015;Koncel-Kedziorski et al., 2015;Shi et al., 2015; expressed in natural language.