What are the two chains for that come with the barbeque?

Its required by Australian standards that (a) if the barbeque is used without a cart, that the barbeque is chained to the gas cylinder to prevent accidental overstretching of the hose; (b) if the barbeque is connected to a reticulated supply of gas that the barbeque is chained to a strong point near the gas supply outlet to prevent accidental overstretching of the hose. It is also required for the barbeque to have a means of manually lighting should the ignition system fail. The smaller chain has a match holder to help in case of this almost impossible occurrence.