Up to 128 characters may be used at any one time.

Why do we even have to use new characters for numbers?

We just use characters, and they're about all used up.

You can even use more than 140 characters to say it!

And second, that they wouldn't allow me to use special characters.

People would have to use characters straight from the Table.

In this case, only a single character set argument is used.

Each character can only be used once for five rounds.

Say they used 10 characters, which is probably more than usual.

They were told, for example, to use five characters and three scenes.