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good day to all, can anyone help me how can my program read if a letter is inputted again it prompts "letter inputted already"? heres my code: #include <stdio.h> #include <string.h> #include <conio.h> int main() { char alphabet[26] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; char letter; int i; for(i = 0; i < 26; … |