This is only the diagrams for the letters, numbers and symbols.
How many mask you want to use is up to you.

I used 25 mask x 28 rows for one square, and then fitted the letter to i was in the center.

I used cotton yarn and hook 3mm, but that you can also change so it fit to your own blanket.

NEW IDEA to use the letters/numbers to:
Maria Bugge has made some birthday flags for her little Sofia! Great idea! See the picture!