A method comprising treating an article with steam, wherein the article comprises a composition comprising an amount of a polysiloxane-polycarbonate copolymer effective to provide thermal and hydrolytic stability to the article for at least 15 cycles, wherein each cycle comprises 20 minutes of contact with steam at 100\xb0 C. 4 g or consumer fireworks includes a base to which the fireworks are secured to prevent tipping thereof during shooting. A control unit accepts an input of any input numeral key from among the plurality of the input numeral keys displayed in the first display area and decides the input of the accepted input numeral key. If it is determined that the vehicle traveling along the oncoming lane is approaching the unmanned vehicle, then the target speed of the unmanned vehicle is reduced, whereby the unmanned vehicle is caused to travel at a low guiding speed.