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Kanzi and Mulika comprehended the lexigrams with far more ease than S&A. Also used them far more spontaneously
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K&M were far more able to comprehend spoken English words
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K&M used the lexigrams far more specifically (i.e. to differentiate between cake/juice, whereas S&A would use more general terms such as "food")
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Kanzi was able to refer to requests involving others. Austin and Sherman never formed requests where another was the beneficiary