It took a few months, working In a massive multiple million lines of code "rules engine". The first bit was really understanding how recursion works and how to

It took a few months, working In a massive multiple million lines of code "rules engine". The first bit was really understanding how recursion works and how to trace the code. After that close understanding of logical operations like cut, or negation, and the most important was how certain operations could really impact performance to the point the were mostly "outlawed". It's been years since I've used prolog, but I could probably pick it back up in a few weeks.