Frog won't move in all directions

After completing all the rules for moving the frog and ending the game, the student finds that the frog only moves in one direction; that is, the frog does not respond to the other arrow keys. Why?
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Created:May 28, 2015
Played:107
Agent:11
Rules:28
Methods:13
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After completing all the rules for moving the frog and ending the game, the student finds that the frog only moves in one direction; that is, the frog does not respond to the other arrow keys. Why?
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Design