C. We don't need it with K and S
z it would maybe stop me from zzzzzzzzzzzzzzz feeling so darn tired all the time
The letter O. You could substitute with a 0 (zero), and few would know.
z....cos we hardly use it anyway..
K -we dont need it when we have c.Why use c and k together all the time anyway?
x, because it's too damn hard to prounouce X-D (oh wait, I wouldn't be able to make those faces, nevermind)