Is there a reason Lego releases a braille polybag with only 8 bricks?

Maybe someone who is visually impaired or knows more about their community knows more about this, and why they choose these 8 bricks for A/1, B/2, C/3, D/4, E/5, G/7, L & O submitted by /u/Lama_For_Hire [link] [comments]