Simplest puzzle ever. Or is it? ================

Your goal is from four pieces put together one simple square. How easy is that, or can you manage it at all? :) Is this puzzle just easy to print and also simply to solve? You never know before trying them both...

Original pieces are 3 millimetres high and solved square is exactly 50x50 millimetres, but you can scale it as you wish.

Happy solving!