I have always wondered, and today I decided to find out for myself. There are 4 blocks of 6 dots max on any Canadian bill. They always have 6 dots the reason being is because the government wanted it to be distinct as to not cause any confusion to the visually impaired person.

5$ = 1 full block
10$ = 2 full blocks
20$ = 3 full blocks
50$ = 4 full blocks
100$ = 2 full blocks but 1 block is on the far left, and 1 is on the far right.