From the next page, each button is written as follows.
1)UP&RIGHT is written as "UP key", and 2)DOWN&LEFT is written as "DOWN key".
(When the keys are used for up-and-down movement.)
In addition, 1)UP&RIGHT is written as "RIGHT key", and 2)DOWN&LEFT is written as "LEFT key".
(When the keys are used for right-and-left movement.)
3)ENTER is written as "ENTER key".
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