For example, by chaining even small numbers of direct associations, such as breakfast -pancakes, pancakes -hashbrowns, hashbrowns -potato, and potato -field, a model that does not control for semantic drift may be tempted to answer questions about breakfast venues with answers that discuss wheat fields or soccer fields.
the translation table for t (q|a) is computed using GIZA++ (Och and Ney, 2003).