Chain

When the house lights on, that no one ever thinks about, and what needed to be done, that would be all the same, this light came into the house, and already gives warmth and comfort. And it's fun to test yourself on the knowledge and skills to do the right thing, and do not only good, but also miracles. And now you try to connect everything so that it would not happen circuit, and that the light bulb would still light up, and not rotten.