Itosu yon kata

Chudan uchi uke, gedan barai, jodan age uke, chudan uchi uke. Chudan seiken tsuki.

Notice that one hand moves along curves and the other hand along a straight line. One hand embodies uke principles and the other one tsuki principles.

Uke tries to consume as much space it can expanding your body reach, while tsuki is the opposite.