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Using the text to evaluate short answers for reading comprehension…

- - - - This boolean feature is true if
        both learner and target answer link to the same
        source sentence, and false otherwise
    - - entropy between the alignment weights between two most-likely source sentences for the learner answer treated as normalized probability
    - - the first feature according to the second, taking the entropy as a confidence score for the binary feature
    - - captures the distance (in number of sentences) between the
        source sentence linked to the learner answer and that linked to the target answer