Goneril wishes to transmit a gold bracelet to Regan. Since the two are some distance apart, they must use a messenger. To ensure that the messenger does not steal the gold, the pouch must be sealed with a padlock. Both women have a supply of padlocks with their keys, but neither has a key for any of the padlocks of the other. However, it is possible to transmit the gold safely for Regan to access it. Explain how. (Easy.)