It sometimes has a small foot section with a single key.

The search for a single key to success never worked.

At a point near the heel of the hand is a space bar and above that a single key for the period.

You want an algorithm where there is no choice other than to try every single key.

Thus, any single key must only be used for messages of a fixed and known length.

Did all the doors open and lock with a single key?

A changing work force has put an increased premium on education as the single most important key to success.

Everybody in the home is going to be using a single pre-shared key.

There is no single key to wisdom in this thing.

Then, putting them back in the dead scientist's pocket, he held up the single key.