For this reason, color should not be used alone to give information.

Few teachers even knew they existed, let alone used them.

These can be used together or alone, depending on the treatment plan.

They can be used alone or along with light therapy.

In fact, positive consequences are not always enough when used alone.

These can be used alone or combined to cover a larger area.

If used alone, it may take several months to see any improvement.

The music, 80 minutes of it, is alone used to set the mood.

The combination leads to better results than either treatment used alone.

Of course, it had probably been worse in the days when he used to have to hunt alone.