t_ku    <Up>            arrow up                        *t_ku* *'t_ku'*
        t_kd    <Down>          arrow down                      *t_kd* *'t_kd'*
        t_kr    <Right>         arrow right                     *t_kr* *'t_kr'*
        t_kl    <Left>          arrow left                      *t_kl* *'t_kl'*