You have a friend that lives in this city. He sounded very happy to know that you were shifting to the same city. He welcomed you to his cute house. You readily accepted the invitation because you too wanted to meet your childhood friend. You went to the given address, entered the house that belonged to your friend and sat down in the living room as you could not meet anyone in the house. You waited for a long time but your friend did not come. You decided to leave but the main door of the house was locked. Imagine this has actually happened with you. Can you escape from the house?