Cheat Sheets - the Polish Way

One of our profs told was put in a sticky situation: He was trying to tell us how to use cheat sheets in the most productive way. The only thing is, cheat sheets are not allowed in class. He tried this way "I realize that cheat sheets are illegal. However, I know there are people who use these sheets, and I do not catch them. If you are ever in such a situation, there are better and worse ways to use these sheets: ... "The techniques are however, the same in Poland as in Canada.