In an exemplary embodiment, a computer-implemented method includes providing a mapping between a set of two or more IP addresses and a set of two more servers. The mask body includes an outer layer sheet and an intermediate layer sheet. In the tapering section, both a first ratio of the diameter of the fibre core to the diameter of the fibre cladding and also a second ratio of the diameter of the mode field of the laser radiation conducted in the optical fibre to the diameter of the fibre core, increases in the first direction for each optical fibre. The sleeve and the shank together define a size conversion structure for the shackle. Such methods generally comprise the steps of: providing a seed solution comprising a gold nanoparticle; providing an aqueous growth solution comprising: cetyltrimethylammonium bromide, hydrogen tetrachloroaurate, and hydroquinone; and adding a quantity of the seed solution to the aqueous growth solution.