And within a race each individual had his own private code of symbolism.

One thing led to another, and pretty soon we cooked up a private code you know, just for us, our secret.

And when you do find them, call me at once on my private code.

It might have been a private code, or a warning.

Somebody who had the private codes wanted to talk.

Any mother he need to rap with knows his private code.

He didn't know Naomi's private code, if she had one.

That was their private code for something which could not be discussed in the clear.

When the phone answered he gave it the private code she'd given him but kept his face plate off.

Only a few people had his private code, and therefore any calls to it were likely to be important.