EVERYBODY IN THIS IS A TOTALLY FRIENDLY MEETING THERE HAS BEEN REPORTS OF PEOPLE TRYING TO COPY US USING DIFFERENT NAMES EVERYBODY GET READY FOR and it says that this page is not allowed so i cant do it

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.