Alternatively, the candidate set can be defined by all human-suggested substitutions for the given target word in all of its contexts; then, the focus is just on the ranking problem (Erk and Padó, 2010;Thater et al., 2010;Dinu and Lapata, 2010;Thater et al., 2011).
the most important features describe the syntagmatic coherence of the substitution in context, measured as local n-gram frequencies obtained from web data.