Sentences of a paragraph are given below in jumbled order. Arrange the sentences in the correct order to form a meaningful and coherent paragraph.

A. Louis was enthralled by the concept of a raised dots system.

B. He made up his mind to use the technique to represent an alphabetic code.

C. Blind persons could read large - letter books that are bulky with the aid of this alphabet code.

D. Additionally, he developed the six - dot cell technology, which was at his fingertips.