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Thank you for the kind words!

Regarding companies that use Prolog, here are a few examples:

A third of all airline traffic is handled by systems that run SICStus Prolog:

A large portion of the New Zealand stock exchange is powered by Prolog:

Oracle uses Prolog in the JVM specification:

IBM has used Prolog for natural language processing in Watson:

RedPrairie uses SICStus Prolog for optimization tasks.

Prolog is used for voice processing on the International Space Station.