Here is a link to the course:
Many thanks to JeffHammerbacher for creating the course. I’m not sure if he is still maintaining it. I have come across quite a number of synonyms that need to be disambiguated. Also a couple of mistakes. And there are a many words that are now in the Duolingo Italian course that could be added. I will be glad to provide details. Or, I would be very happy to be added as contributor on the course and work on these issues. I have experience doing this with another course. (Will be glad to provide details about that as well.) Thank you! Would really appreciate being able to sort out these problems. It is a valuable course.