Thank you for replying.
I got your idea. A timer that would count down, and use "key_lastpressed" function for the last input.
But there is some problem remaining. what about "↘", that require both "↓"&"→". And what about holding, say I'm making a guy like GUILE(street fighter).
OK I'll check the AUM for answer or some ider.
Thanks again for the kindheart! wish you happy.