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  Indian J Med Microbiol
 

Figure 2: Multistage user interface developed for typing Persian/Arabic letters, using five repetitive visual stimulis. The interface includes 32 Persian letters, “space,” “clear,” “clear all” and “?.” The letters are arranged based on their rate of use in Persian documents, and their similarity. Each letter can be spelled by 2–4 selections; 16 high-rate letters are spelled with two selections, and eight low-rate letters with 4 selections

Figure 2: Multistage user interface developed for typing Persian/Arabic letters, using five repetitive visual stimulis. The interface includes 32 Persian letters, “space,” “clear,” “clear all” and “?.” The letters are arranged based on their rate of use in Persian documents, and their similarity. Each letter can be spelled by 2–4 selections; 16 high-rate letters are spelled with two selections, and eight low-rate letters with 4 selections