I'm trying to convert all my LibreOffice diagrams to TikZ, to make my Latex document slightly prettier. I've come across a problem. There are a few symbols that I don't know how to do – and due to my general lack of knowledge about TikZ don't know how to create. I figured that this must be pretty easy work in TikZ, and since I couldn't find much proper documentation, I thought I'd ask for help here.
The symbols I want to create are the ones in this image
Obviously the arrows are easy, and the rounded edges rectangle is easy as well (because the line half way down is optional), but I'm not sure how I'd get the rectangle with the missing side and the rectangle with a dash in the corner?