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Interestingly, the short story Blind Alley is the only story set in the Foundation universe to feature non-human intelligence (not counting robots and Gaia).
Asimov later integrated them into his all-engulfing Foundation series. Some contortion was required to explain how the robots of the Robot Series are almost completely absent from the Empire novels. In reality, this was due to the magazine editor Asimov worked with at the time (John W. Campbell) disliking robots in science fiction, and discouraging (forbidding?) Asimov from including them.