You've probably heard the story about the researcher who trained a frog to jump whenever the command "jump" was given. Then, as the story goes, misfortune befell the frog, resulting in the loss of its back legs. The next time the researcher said "jump" to the frog, it remained motionless. After repeating "jump" several times, the technician noted in the laboratory logbook: "Amputating a frog's back legs causes it to go deaf."
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