The danish flag is a white cross on a red background. If you cut out the white cross, you will be left with four rectangles of red, which can be pushed together and sewn up again, forming a solid red flag

I see. I was wondering where the hammer and sickle came in, since without those is it really a communist flag?

They were red as well, so you couldn't see them

Took me two reads but he cut his line out of the list, taped it back together and replaced the list on the wall, without his line.