How does Duolingo figure out if there is a typo in a answer?
I am learning French from English. I had to write, "I play with your dog", while i had a typo and wrote "I play with you dog". This was not marked as typo. While the other day, I wrote a sentence which I felt was wrong but Duo considered it a typo. So, how does Duolingo figure out if there is a typo in an answer?