#define KEYBOARD_LEFT 'h'
#define KEYBOARD_RIGHT 'l'
#define KEYBOARD_DOWN 'j'
#define KEYBOARD_UP 'k'
#define KEYBOARD_ZOOM_IN 'z'
#define KEYBOARD_ZOOM_OUT 'x'

#define KEYBOARD_HOME 'n'
#define KEYBOARD_END 'm'

#define KEYBOARD_PAGE_UP 'u'
#define KEYBOARD_PAGE_DOWN 'i'

#define KEYBOARD_JUMP_LEFT 'y'
#define KEYBOARD_JUMP_RIGHT 'o'