>>You are on a horse galloping at a constant speed. On your right
>>side is a sharp drop-off, and on your left side is an elephant
>>traveling at the same speed as you.
>>
>>Directly in front of you is a galloping kangaroo and your horse is
>>unable to overtake it. Behind you is a lion running at the same
>>speed as you and the kangaroo.
>>
>>What must
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