At present there are more than 4,000 images on the computer, seemingly in random order.

Each jar was presented ten times in a random order, and a measurement was made of the volume of air sniffed by the patient.

Each letter flashes up in a random order - the user has to concentrate on the letter to be written.

There were other considerations, to be sure, but the fact that wins and losses occur in random order was just ignored.

The subjects then listened to 100 snippets, each just a fragment of a second, of both songs, played in random order.