I fail to understand the logic, or rather lack of of it, in the people who construct these Duolingo lessons. First, we are told in the Tips that many people think Swedish plurals are difficult because they are all irregular. We are told this perception is false: there are rules. Then we are taught the rules. The logical and sensible thing to do would then be for there to be a few lessons, at the very least the Level 0 ones, to practise those plurals that follow the rules. But, instead the very opening remarks in the Tips are undermined by the very first lesson being full of irregular plurals.