Man has always sought to make his life easier. And so people created a simple Lexi program, and it turned out to be too smart. She quickly dealt with a car collapse on the roads. Rejoicing in success, people shifted the task of garbage disposal to the program. Gradually, new functions, social and economic control began to be transferred to the program. Lexi did not order, 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 pleased, because this is why she was created. Everything was harmonious, calculated to the smallest detail, but one small inaccuracy in the program changed everything.