The graduation speech to the math representative contains numbers.

Our friendship is like a linear function that always goes up, it will only go up, not down.

I wish you perfection and learn from you by going up a flight of stairs.

We have changed from two parallel lines to a crossed triangle, but we will soon return to our original position, but I firmly believe that our feelings will never end like a circle ~ I wish you peace in your life and our friendship will last forever.