I have many lingqs that I have learnt and which I don't want to have to review each time I open up flash cards. After the flash card comes up, I click on the word and it offers me "oops" or "got it". I click on the number 4 and the box comes up to mark the word for later review. I Mark it, for instance to review in 90 days, and then I have to hit "got it" in order to continue. But the word remains active in my flash cards! How do I make known lings go away?