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anyone can write a rudimentary AI. One simply needs a small amount of programming knowledge and the task is easy to do.
if we define AI as a fully functional and intelligent piece of software, then yes - that has not been created.
The argument really depends upon how you define the "intelligence" in "artificial intelligence." Plotting a regression line is considered by some to be an example of "machine intelligence." Most people would probably consider such a definition unsatisfactory.
This is dependent on constantly redefining the term "artificial intelligence" to exclude the most recently developed goal-directed systems.