Assume that you are living in a colony which has numerous houses. And on one day the gate keeper didn’t return for the duty. And so the main gate of the colony is locked, but you want to go out. And unfortunately the secretary of the colony went out for vacation. You know that a spare key will be in his house. So use you skills to collect the necessary items from the colony to get the key from the house to open the main gate of the colony.We’ll see it!.