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called for them. I taught him to say "yes" and "no" by the waving of his trunk, and made him appreciate that he was to use that means of signifying to me whether he understood me or not.
After I was well into the work, the morning lesson would go somewhat as follows:
"Are you ready for your lesson, Ulysses?"
Ulysses lifts his trunk affirmatively. Although he does not understand "lesson," the word "ready"
