Man has always sought to make his life easier. So people created a simple program called Lexi, and it turned out to be too smart. She quickly dealt with the traffic jam on the roads. Rejoicing at the success, people transferred the task of waste disposal to the program. Gradually, the program began to be transferred to new functions, social and economic control. Lexie didn't give orders, she only advised, but her advice was valuable, and people began to trust them unconditionally. Lexi began to build cities, space stations on Mars, people were happy, because that’s what she was created for. Everything was harmonious, calculated down to the smallest detail, but one small inaccuracy in the program changed everything.