What are the two possible lengths Maha could be thinking of? I am thinking of a length in centimetres. My length is a whole number of centimetres. It is smaller than o.673 m but larger than 659 mm.

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.