Three punches - Oi-Tsuki Jodan, Chudan, Chudan in one step
Double Punch - Punch Oi-Tsuki then Gyaku-Tsuki in one step
Mountain Punch - Jodan and Chudan Oi-tsuki at the same time in Zenkutsu Hanmi (As in Bassai Dai & Wankan)
Double Front Kick - Kick Mae-Geri Chudan land and then Kick Mae-Geri Jodan (This is often done with a small step in between kicks rather than it being two separate kicks from Zenkutsu