An example of graceful fallback in the context of a vocabulary tutoring system would be a case when the system might not be able to use a lexical unit in certain types of activities due to the lack of semantic information available about the unit, but would still incorporate it into simpler activity types that do not rely on com- putational semantics.
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logan - (no access) - Chukharev-Hudilainen, Evgeny and Tatiana A. Klepikova: "The effectiveness of computer-based spaced repetition in foreign language vocabulary instruction: a double-blind study", p338
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