How many Deaf / Hard of Hearing people are in Dominican Republic? What sign languages are used in Dominican Republic? How do you say Dominic

How many Deaf / Hard of Hearing people are in Cameroon? What sign languages are used in Cameroon? How do you say Cameroon in sign language?

How many Deaf / Hard of Hearing people are in Chad? What sign languages are used in Chad? How do you say Chad in sign language?