Ministers are permitted to use ordinary lockable briefcases to transport information which has been classified 'Confidential' or below. For information with a higher security level (such as 'Secret') they are required to use dispatch boxes, which offer a higher level of security, and which are usually red. However a travel version of the despatch box is also available in black, which offers the same level of security as a red despatch box, but is designed to be less conspicuous. In practice Ministers use despatch boxes for transporting the majority of their documents due to the greater level of security they offer.

The XORed sequence has the same period as the sequence that is not XORed.

Conversely, in fisheries with increasing sideboards, economic benefit could be denied to the sideboarded sectors.

The billiard sharp whom anyone catches / His doom's extremely hard— …